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<body class="manpage">
<div id="header">
<h1>
git-rev-parse(1) Manual Page
</h1>
<h2>NAME</h2>
<div class="sectionbody">
<p>git-rev-parse -
Pick out and massage parameters
</p>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_synopsis">SYNOPSIS</h2>
<div class="sectionbody">
<div class="verseblock">
<pre class="content"><em>git rev-parse</em> [<options>] <arg>…</pre>
<div class="attribution">
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph"><p>Many Git porcelainish commands take a mixture of flags
(i.e. parameters that begin with a dash <em>-</em>) and parameters
meant for the underlying <em>git rev-list</em> command they use internally
and flags and parameters for the other commands they use
downstream of <em>git rev-list</em>. This command is used to
distinguish between them.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_options">OPTIONS</h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="_operation_modes">Operation Modes</h3>
<div class="paragraph"><p>Each of these options must appear first on the command line.</p></div>
<div class="dlist"><dl>
<dt class="hdlist1">
--parseopt
</dt>
<dd>
<p>
Use <em>git rev-parse</em> in option parsing mode (see PARSEOPT section below).
</p>
</dd>
<dt class="hdlist1">
--sq-quote
</dt>
<dd>
<p>
Use <em>git rev-parse</em> in shell quoting mode (see SQ-QUOTE
section below). In contrast to the <code>--sq</code> option below, this
mode only does quoting. Nothing else is done to command input.
</p>
</dd>
</dl></div>
</div>
<div class="sect2">
<h3 id="_options_for_parseopt">Options for --parseopt</h3>
<div class="dlist"><dl>
<dt class="hdlist1">
--keep-dashdash
</dt>
<dd>
<p>
Only meaningful in <code>--parseopt</code> mode. Tells the option parser to echo
out the first <code>--</code> met instead of skipping it.
</p>
</dd>
<dt class="hdlist1">
--stop-at-non-option
</dt>
<dd>
<p>
Only meaningful in <code>--parseopt</code> mode. Lets the option parser stop at
the first non-option argument. This can be used to parse sub-commands
that take options themselves.
</p>
</dd>
<dt class="hdlist1">
--stuck-long
</dt>
<dd>
<p>
Only meaningful in <code>--parseopt</code> mode. Output the options in their
long form if available, and with their arguments stuck.
</p>
</dd>
</dl></div>
</div>
<div class="sect2">
<h3 id="_options_for_filtering">Options for Filtering</h3>
<div class="dlist"><dl>
<dt class="hdlist1">
--revs-only
</dt>
<dd>
<p>
Do not output flags and parameters not meant for
<em>git rev-list</em> command.
</p>
</dd>
<dt class="hdlist1">
--no-revs
</dt>
<dd>
<p>
Do not output flags and parameters meant for
<em>git rev-list</em> command.
</p>
</dd>
<dt class="hdlist1">
--flags
</dt>
<dd>
<p>
Do not output non-flag parameters.
</p>
</dd>
<dt class="hdlist1">
--no-flags
</dt>
<dd>
<p>
Do not output flag parameters.
</p>
</dd>
</dl></div>
</div>
<div class="sect2">
<h3 id="_options_for_output">Options for Output</h3>
<div class="dlist"><dl>
<dt class="hdlist1">
--default <arg>
</dt>
<dd>
<p>
If there is no parameter given by the user, use <code><arg></code>
instead.
</p>
</dd>
<dt class="hdlist1">
--prefix <arg>
</dt>
<dd>
<p>
Behave as if <em>git rev-parse</em> was invoked from the <code><arg></code>
subdirectory of the working tree. Any relative filenames are
resolved as if they are prefixed by <code><arg></code> and will be printed
in that form.
</p>
<div class="paragraph"><p>This can be used to convert arguments to a command run in a subdirectory
so that they can still be used after moving to the top-level of the
repository. For example:</p></div>
<div class="listingblock">
<div class="content">
<pre><code>prefix=$(git rev-parse --show-prefix)
cd "$(git rev-parse --show-toplevel)"
# rev-parse provides the -- needed for 'set'
eval "set $(git rev-parse --sq --prefix "$prefix" -- "$@")"</code></pre>
</div></div>
</dd>
<dt class="hdlist1">
--verify
</dt>
<dd>
<p>
Verify that exactly one parameter is provided, and that it
can be turned into a raw 20-byte SHA-1 that can be used to
access the object database. If so, emit it to the standard
output; otherwise, error out.
</p>
<div class="paragraph"><p>If you want to make sure that the output actually names an object in
your object database and/or can be used as a specific type of object
you require, you can add the <code>^{type}</code> peeling operator to the parameter.
For example, <code>git rev-parse "$VAR^{commit}"</code> will make sure <code>$VAR</code>
names an existing object that is a commit-ish (i.e. a commit, or an
annotated tag that points at a commit). To make sure that <code>$VAR</code>
names an existing object of any type, <code>git rev-parse "$VAR^{object}"</code>
can be used.</p></div>
<div class="paragraph"><p>Note that if you are verifying a name from an untrusted source, it is
wise to use <code>--end-of-options</code> so that the name argument is not mistaken
for another option.</p></div>
</dd>
<dt class="hdlist1">
-q
</dt>
<dt class="hdlist1">
--quiet
</dt>
<dd>
<p>
Only meaningful in <code>--verify</code> mode. Do not output an error
message if the first argument is not a valid object name;
instead exit with non-zero status silently.
SHA-1s for valid object names are printed to stdout on success.
</p>
</dd>
<dt class="hdlist1">
--sq
</dt>
<dd>
<p>
Usually the output is made one line per flag and
parameter. This option makes output a single line,
properly quoted for consumption by shell. Useful when
you expect your parameter to contain whitespaces and
newlines (e.g. when using pickaxe <code>-S</code> with
<em>git diff-*</em>). In contrast to the <code>--sq-quote</code> option,
the command input is still interpreted as usual.
</p>
</dd>
<dt class="hdlist1">
--short[=<length>]
</dt>
<dd>
<p>
Same as <code>--verify</code> but shortens the object name to a unique
prefix with at least <code>length</code> characters. The minimum length
is 4, the default is the effective value of the <code>core.abbrev</code>
configuration variable (see <a href="git-config.html">git-config(1)</a>).
</p>
</dd>
<dt class="hdlist1">
--not
</dt>
<dd>
<p>
When showing object names, prefix them with <em>^</em> and
strip <em>^</em> prefix from the object names that already have
one.
</p>
</dd>
<dt class="hdlist1">
--abbrev-ref[=(strict|loose)]
</dt>
<dd>
<p>
A non-ambiguous short name of the objects name.
The option core.warnAmbiguousRefs is used to select the strict
abbreviation mode.
</p>
</dd>
<dt class="hdlist1">
--symbolic
</dt>
<dd>
<p>
Usually the object names are output in SHA-1 form (with
possible <em>^</em> prefix); this option makes them output in a
form as close to the original input as possible.
</p>
</dd>
<dt class="hdlist1">
--symbolic-full-name
</dt>
<dd>
<p>
This is similar to --symbolic, but it omits input that
are not refs (i.e. branch or tag names; or more
explicitly disambiguating "heads/master" form, when you
want to name the "master" branch when there is an
unfortunately named tag "master"), and shows them as full
refnames (e.g. "refs/heads/master").
</p>
</dd>
<dt class="hdlist1">
--output-object-format=(sha1|sha256|storage)
</dt>
<dd>
<p>
Allow oids to be input from any object format that the current
repository supports.
</p>
<div class="literalblock">
<div class="content">
<pre><code>Specifying "sha1" translates if necessary and returns a sha1 oid.</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>Specifying "sha256" translates if necessary and returns a sha256 oid.</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>Specifying "storage" translates if necessary and returns an oid in
encoded in the storage hash algorithm.</code></pre>
</div></div>
</dd>
</dl></div>
</div>
<div class="sect2">
<h3 id="_options_for_objects">Options for Objects</h3>
<div class="dlist"><dl>
<dt class="hdlist1">
--all
</dt>
<dd>
<p>
Show all refs found in <code>refs/</code>.
</p>
</dd>
<dt class="hdlist1">
--branches[=<pattern>]
</dt>
<dt class="hdlist1">
--tags[=<pattern>]
</dt>
<dt class="hdlist1">
--remotes[=<pattern>]
</dt>
<dd>
<p>
Show all branches, tags, or remote-tracking branches,
respectively (i.e., refs found in <code>refs/heads</code>,
<code>refs/tags</code>, or <code>refs/remotes</code>, respectively).
</p>
<div class="paragraph"><p>If a <code>pattern</code> is given, only refs matching the given shell glob are
shown. If the pattern does not contain a globbing character (<code>?</code>,
<code>*</code>, or <code>[</code>), it is turned into a prefix match by appending <code>/*</code>.</p></div>
</dd>
<dt class="hdlist1">
--glob=<pattern>
</dt>
<dd>
<p>
Show all refs matching the shell glob pattern <code>pattern</code>. If
the pattern does not start with <code>refs/</code>, this is automatically
prepended. If the pattern does not contain a globbing
character (<code>?</code>, <code>*</code>, or <code>[</code>), it is turned into a prefix
match by appending <code>/*</code>.
</p>
</dd>
<dt class="hdlist1">
--exclude=<glob-pattern>
</dt>
<dd>
<p>
Do not include refs matching <em><glob-pattern></em> that the next <code>--all</code>,
<code>--branches</code>, <code>--tags</code>, <code>--remotes</code>, or <code>--glob</code> would otherwise
consider. Repetitions of this option accumulate exclusion patterns
up to the next <code>--all</code>, <code>--branches</code>, <code>--tags</code>, <code>--remotes</code>, or
<code>--glob</code> option (other options or arguments do not clear
accumulated patterns).
</p>
<div class="paragraph"><p>The patterns given should not begin with <code>refs/heads</code>, <code>refs/tags</code>, or
<code>refs/remotes</code> when applied to <code>--branches</code>, <code>--tags</code>, or <code>--remotes</code>,
respectively, and they must begin with <code>refs/</code> when applied to <code>--glob</code>
or <code>--all</code>. If a trailing <em>/*</em> is intended, it must be given
explicitly.</p></div>
</dd>
<dt class="hdlist1">
--exclude-hidden=(fetch|receive|uploadpack)
</dt>
<dd>
<p>
Do not include refs that would be hidden by <code>git-fetch</code>,
<code>git-receive-pack</code> or <code>git-upload-pack</code> by consulting the appropriate
<code>fetch.hideRefs</code>, <code>receive.hideRefs</code> or <code>uploadpack.hideRefs</code>
configuration along with <code>transfer.hideRefs</code> (see
<a href="git-config.html">git-config(1)</a>). This option affects the next pseudo-ref option
<code>--all</code> or <code>--glob</code> and is cleared after processing them.
</p>
</dd>
<dt class="hdlist1">
--disambiguate=<prefix>
</dt>
<dd>
<p>
Show every object whose name begins with the given prefix.
The <prefix> must be at least 4 hexadecimal digits long to
avoid listing each and every object in the repository by
mistake.
</p>
</dd>
</dl></div>
</div>
<div class="sect2">
<h3 id="_options_for_files">Options for Files</h3>
<div class="dlist"><dl>
<dt class="hdlist1">
--local-env-vars
</dt>
<dd>
<p>
List the GIT_* environment variables that are local to the
repository (e.g. GIT_DIR or GIT_WORK_TREE, but not GIT_EDITOR).
Only the names of the variables are listed, not their value,
even if they are set.
</p>
</dd>
<dt class="hdlist1">
--path-format=(absolute|relative)
</dt>
<dd>
<p>
Controls the behavior of certain other options. If specified as absolute, the
paths printed by those options will be absolute and canonical. If specified as
relative, the paths will be relative to the current working directory if that
is possible. The default is option specific.
</p>
<div class="paragraph"><p>This option may be specified multiple times and affects only the arguments that
follow it on the command line, either to the end of the command line or the next
instance of this option.</p></div>
</dd>
</dl></div>
<div class="paragraph"><p>The following options are modified by <code>--path-format</code>:</p></div>
<div class="dlist"><dl>
<dt class="hdlist1">
--git-dir
</dt>
<dd>
<p>
Show <code>$GIT_DIR</code> if defined. Otherwise show the path to
the .git directory. The path shown, when relative, is
relative to the current working directory.
</p>
<div class="paragraph"><p>If <code>$GIT_DIR</code> is not defined and the current directory
is not detected to lie in a Git repository or work tree
print a message to stderr and exit with nonzero status.</p></div>
</dd>
<dt class="hdlist1">
--git-common-dir
</dt>
<dd>
<p>
Show <code>$GIT_COMMON_DIR</code> if defined, else <code>$GIT_DIR</code>.
</p>
</dd>
<dt class="hdlist1">
--resolve-git-dir <path>
</dt>
<dd>
<p>
Check if <path> is a valid repository or a gitfile that
points at a valid repository, and print the location of the
repository. If <path> is a gitfile then the resolved path
to the real repository is printed.
</p>
</dd>
<dt class="hdlist1">
--git-path <path>
</dt>
<dd>
<p>
Resolve "$GIT_DIR/<path>" and takes other path relocation
variables such as $GIT_OBJECT_DIRECTORY,
$GIT_INDEX_FILE… into account. For example, if
$GIT_OBJECT_DIRECTORY is set to /foo/bar then "git rev-parse
--git-path objects/abc" returns /foo/bar/abc.
</p>
</dd>
<dt class="hdlist1">
--show-toplevel
</dt>
<dd>
<p>
Show the (by default, absolute) path of the top-level directory
of the working tree. If there is no working tree, report an error.
</p>
</dd>
<dt class="hdlist1">
--show-superproject-working-tree
</dt>
<dd>
<p>
Show the absolute path of the root of the superproject’s
working tree (if exists) that uses the current repository as
its submodule. Outputs nothing if the current repository is
not used as a submodule by any project.
</p>
</dd>
<dt class="hdlist1">
--shared-index-path
</dt>
<dd>
<p>
Show the path to the shared index file in split index mode, or
empty if not in split-index mode.
</p>
</dd>
</dl></div>
<div class="paragraph"><p>The following options are unaffected by <code>--path-format</code>:</p></div>
<div class="dlist"><dl>
<dt class="hdlist1">
--absolute-git-dir
</dt>
<dd>
<p>
Like <code>--git-dir</code>, but its output is always the canonicalized
absolute path.
</p>
</dd>
<dt class="hdlist1">
--is-inside-git-dir
</dt>
<dd>
<p>
When the current working directory is below the repository
directory print "true", otherwise "false".
</p>
</dd>
<dt class="hdlist1">
--is-inside-work-tree
</dt>
<dd>
<p>
When the current working directory is inside the work tree of the
repository print "true", otherwise "false".
</p>
</dd>
<dt class="hdlist1">
--is-bare-repository
</dt>
<dd>
<p>
When the repository is bare print "true", otherwise "false".
</p>
</dd>
<dt class="hdlist1">
--is-shallow-repository
</dt>
<dd>
<p>
When the repository is shallow print "true", otherwise "false".
</p>
</dd>
<dt class="hdlist1">
--show-cdup
</dt>
<dd>
<p>
When the command is invoked from a subdirectory, show the
path of the top-level directory relative to the current
directory (typically a sequence of "../", or an empty string).
</p>
</dd>
<dt class="hdlist1">
--show-prefix
</dt>
<dd>
<p>
When the command is invoked from a subdirectory, show the
path of the current directory relative to the top-level
directory.
</p>
</dd>
<dt class="hdlist1">
--show-object-format[=(storage|input|output)]
</dt>
<dd>
<p>
Show the object format (hash algorithm) used for the repository
for storage inside the <code>.git</code> directory, input, or output. For
input, multiple algorithms may be printed, space-separated.
If not specified, the default is "storage".
</p>
</dd>
<dt class="hdlist1">
--show-ref-format
</dt>
<dd>
<p>
Show the reference storage format used for the repository.
</p>
</dd>
</dl></div>
</div>
<div class="sect2">
<h3 id="_other_options">Other Options</h3>
<div class="dlist"><dl>
<dt class="hdlist1">
--since=<datestring>
</dt>
<dt class="hdlist1">
--after=<datestring>
</dt>
<dd>
<p>
Parse the date string, and output the corresponding
--max-age= parameter for <em>git rev-list</em>.
</p>
</dd>
<dt class="hdlist1">
--until=<datestring>
</dt>
<dt class="hdlist1">
--before=<datestring>
</dt>
<dd>
<p>
Parse the date string, and output the corresponding
--min-age= parameter for <em>git rev-list</em>.
</p>
</dd>
<dt class="hdlist1">
<arg>…
</dt>
<dd>
<p>
Flags and parameters to be parsed.
</p>
</dd>
</dl></div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_specifying_revisions">SPECIFYING REVISIONS</h2>
<div class="sectionbody">
<div class="paragraph"><p>A revision parameter <em><rev></em> typically, but not necessarily, names a
commit object. It uses what is called an <em>extended SHA-1</em>
syntax. Here are various ways to spell object names. The
ones listed near the end of this list name trees and
blobs contained in a commit.</p></div>
<div class="admonitionblock">
<table><tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">This document shows the "raw" syntax as seen by git. The shell
and other UIs might require additional quoting to protect special
characters and to avoid word splitting.</td>
</tr></table>
</div>
<div class="dlist"><dl>
<dt class="hdlist1">
<em><sha1></em>, e.g. <em>dae86e1950b1277e545cee180551750029cfe735</em>, <em>dae86e</em>
</dt>
<dd>
<p>
The full SHA-1 object name (40-byte hexadecimal string), or
a leading substring that is unique within the repository.
E.g. dae86e1950b1277e545cee180551750029cfe735 and dae86e both
name the same commit object if there is no other object in
your repository whose object name starts with dae86e.
</p>
</dd>
<dt class="hdlist1">
<em><describeOutput></em>, e.g. <em>v1.7.4.2-679-g3bee7fb</em>
</dt>
<dd>
<p>
Output from <code>git describe</code>; i.e. a closest tag, optionally
followed by a dash and a number of commits, followed by a dash, a
<em>g</em>, and an abbreviated object name.
</p>
</dd>
<dt class="hdlist1">
<em><refname></em>, e.g. <em>master</em>, <em>heads/master</em>, <em>refs/heads/master</em>
</dt>
<dd>
<p>
A symbolic ref name. E.g. <em>master</em> typically means the commit
object referenced by <em>refs/heads/master</em>. If you
happen to have both <em>heads/master</em> and <em>tags/master</em>, you can
explicitly say <em>heads/master</em> to tell Git which one you mean.
When ambiguous, a <em><refname></em> is disambiguated by taking the
first match in the following rules:
</p>
<div class="olist arabic"><ol class="arabic">
<li>
<p>
If <em>$GIT_DIR/<refname></em> exists, that is what you mean (this is usually
useful only for <code>HEAD</code>, <code>FETCH_HEAD</code>, <code>ORIG_HEAD</code>, <code>MERGE_HEAD</code>,
<code>REBASE_HEAD</code>, <code>REVERT_HEAD</code>, <code>CHERRY_PICK_HEAD</code>, <code>BISECT_HEAD</code>
and <code>AUTO_MERGE</code>);
</p>
</li>
<li>
<p>
otherwise, <em>refs/<refname></em> if it exists;
</p>
</li>
<li>
<p>
otherwise, <em>refs/tags/<refname></em> if it exists;
</p>
</li>
<li>
<p>
otherwise, <em>refs/heads/<refname></em> if it exists;
</p>
</li>
<li>
<p>
otherwise, <em>refs/remotes/<refname></em> if it exists;
</p>
</li>
<li>
<p>
otherwise, <em>refs/remotes/<refname>/HEAD</em> if it exists.
</p>
</li>
</ol></div>
<div class="dlist"><dl>
<dt class="hdlist1">
<code>HEAD</code>
</dt>
<dd>
<p>
names the commit on which you based the changes in the working tree.
</p>
</dd>
<dt class="hdlist1">
<code>FETCH_HEAD</code>
</dt>
<dd>
<p>
records the branch which you fetched from a remote repository with
your last <code>git fetch</code> invocation.
</p>
</dd>
<dt class="hdlist1">
<code>ORIG_HEAD</code>
</dt>
<dd>
<p>
is created by commands that move your <code>HEAD</code> in a drastic way (<code>git
am</code>, <code>git merge</code>, <code>git rebase</code>, <code>git reset</code>), to record the position
of the <code>HEAD</code> before their operation, so that you can easily change
the tip of the branch back to the state before you ran them.
</p>
</dd>
<dt class="hdlist1">
<code>MERGE_HEAD</code>
</dt>
<dd>
<p>
records the commit(s) which you are merging into your branch when you
run <code>git merge</code>.
</p>
</dd>
<dt class="hdlist1">
<code>REBASE_HEAD</code>
</dt>
<dd>
<p>
during a rebase, records the commit at which the operation is
currently stopped, either because of conflicts or an <code>edit</code> command in
an interactive rebase.
</p>
</dd>
<dt class="hdlist1">
<code>REVERT_HEAD</code>
</dt>
<dd>
<p>
records the commit which you are reverting when you run <code>git revert</code>.
</p>
</dd>
<dt class="hdlist1">
<code>CHERRY_PICK_HEAD</code>
</dt>
<dd>
<p>
records the commit which you are cherry-picking when you run <code>git
cherry-pick</code>.
</p>
</dd>
<dt class="hdlist1">
<code>BISECT_HEAD</code>
</dt>
<dd>
<p>
records the current commit to be tested when you run <code>git bisect
--no-checkout</code>.
</p>
</dd>
<dt class="hdlist1">
<code>AUTO_MERGE</code>
</dt>
<dd>
<p>
records a tree object corresponding to the state the
<em>ort</em> merge strategy wrote to the working tree when a merge operation
resulted in conflicts.
</p>
</dd>
</dl></div>
<div class="paragraph"><p>Note that any of the <em>refs/*</em> cases above may come either from
the <code>$GIT_DIR/refs</code> directory or from the <code>$GIT_DIR/packed-refs</code> file.
While the ref name encoding is unspecified, UTF-8 is preferred as
some output processing may assume ref names in UTF-8.</p></div>
</dd>
<dt class="hdlist1">
<em>@</em>
</dt>
<dd>
<p>
<em>@</em> alone is a shortcut for <code>HEAD</code>.
</p>
</dd>
<dt class="hdlist1">
<em>[<refname>]@{<date>}</em>, e.g. <em>master@{yesterday}</em>, <em>HEAD@{5 minutes ago}</em>
</dt>
<dd>
<p>
A ref followed by the suffix <em>@</em> with a date specification
enclosed in a brace
pair (e.g. <em>{yesterday}</em>, <em>{1 month 2 weeks 3 days 1 hour 1
second ago}</em> or <em>{1979-02-26 18:30:00}</em>) specifies the value
of the ref at a prior point in time. This suffix may only be
used immediately following a ref name and the ref must have an
existing log (<em>$GIT_DIR/logs/<ref></em>). Note that this looks up the state
of your <strong>local</strong> ref at a given time; e.g., what was in your local
<em>master</em> branch last week. If you want to look at commits made during
certain times, see <code>--since</code> and <code>--until</code>.
</p>
</dd>
<dt class="hdlist1">
<em><refname>@{<n>}</em>, e.g. <em>master@{1}</em>
</dt>
<dd>
<p>
A ref followed by the suffix <em>@</em> with an ordinal specification
enclosed in a brace pair (e.g. <em>{1}</em>, <em>{15}</em>) specifies
the n-th prior value of that ref. For example <em>master@{1}</em>
is the immediate prior value of <em>master</em> while <em>master@{5}</em>
is the 5th prior value of <em>master</em>. This suffix may only be used
immediately following a ref name and the ref must have an existing
log (<em>$GIT_DIR/logs/<refname></em>).
</p>
</dd>
<dt class="hdlist1">
<em>@{<n>}</em>, e.g. <em>@{1}</em>
</dt>
<dd>
<p>
You can use the <em>@</em> construct with an empty ref part to get at a
reflog entry of the current branch. For example, if you are on
branch <em>blabla</em> then <em>@{1}</em> means the same as <em>blabla@{1}</em>.
</p>
</dd>
<dt class="hdlist1">
<em>@{-<n>}</em>, e.g. <em>@{-1}</em>
</dt>
<dd>
<p>
The construct <em>@{-<n>}</em> means the <n>th branch/commit checked out
before the current one.
</p>
</dd>
<dt class="hdlist1">
<em>[<branchname>]@{upstream}</em>, e.g. <em>master@{upstream}</em>, <em>@{u}</em>
</dt>
<dd>
<p>
A branch B may be set up to build on top of a branch X (configured with
<code>branch.<name>.merge</code>) at a remote R (configured with
the branch X taken from remote R, typically found at <code>refs/remotes/R/X</code>.
</p>
</dd>
<dt class="hdlist1">
<em>[<branchname>]@{push}</em>, e.g. <em>master@{push}</em>, <em>@{push}</em>
</dt>
<dd>
<p>
The suffix <em>@{push}</em> reports the branch "where we would push to" if
<code>git push</code> were run while <code>branchname</code> was checked out (or the current
<code>HEAD</code> if no branchname is specified). Like for <em>@{upstream}</em>, we report
the remote-tracking branch that corresponds to that branch at the remote.
</p>
<div class="paragraph"><p>Here’s an example to make it more clear:</p></div>
<div class="listingblock">
<div class="content">
<pre><code>$ git config push.default current
$ git config remote.pushdefault myfork
$ git switch -c mybranch origin/master
$ git rev-parse --symbolic-full-name @{upstream}
refs/remotes/origin/master
$ git rev-parse --symbolic-full-name @{push}
refs/remotes/myfork/mybranch</code></pre>
</div></div>
<div class="paragraph"><p>Note in the example that we set up a triangular workflow, where we pull
from one location and push to another. In a non-triangular workflow,
<em>@{push}</em> is the same as <em>@{upstream}</em>, and there is no need for it.</p></div>
<div class="paragraph"><p>This suffix is also accepted when spelled in uppercase, and means the same
thing no matter the case.</p></div>
</dd>
<dt class="hdlist1">
<em><rev>^[<n>]</em>, e.g. <em>HEAD^, v1.5.1^0</em>
</dt>
<dd>
<p>
A suffix <em>^</em> to a revision parameter means the first parent of
that commit object. <em>^<n></em> means the <n>th parent (i.e.
<em><rev>^</em>
is equivalent to <em><rev>^1</em>). As a special rule,
<em><rev>^0</em> means the commit itself and is used when <em><rev></em> is the
object name of a tag object that refers to a commit object.
</p>
</dd>
<dt class="hdlist1">
<em><rev>~[<n>]</em>, e.g. <em>HEAD~, master~3</em>
</dt>
<dd>
<p>
A suffix <em>~</em> to a revision parameter means the first parent of
that commit object.
A suffix <em>~<n></em> to a revision parameter means the commit
object that is the <n>th generation ancestor of the named
commit object, following only the first parents. I.e. <em><rev>~3</em> is
equivalent to <em><rev>^^^</em> which is equivalent to
<em><rev>^1^1^1</em>. See below for an illustration of
the usage of this form.
</p>
</dd>
<dt class="hdlist1">
<em><rev>^{<type>}</em>, e.g. <em>v0.99.8^{commit}</em>
</dt>
<dd>
<p>
A suffix <em>^</em> followed by an object type name enclosed in
brace pair means dereference the object at <em><rev></em> recursively until
an object of type <em><type></em> is found or the object cannot be
dereferenced anymore (in which case, barf).
For example, if <em><rev></em> is a commit-ish, <em><rev>^{commit}</em>
describes the corresponding commit object.
Similarly, if <em><rev></em> is a tree-ish, <em><rev>^{tree}</em>
describes the corresponding tree object.
<em><rev>^0</em>
is a short-hand for <em><rev>^{commit}</em>.
</p>
<div class="paragraph"><p><em><rev>^{object}</em> can be used to make sure <em><rev></em> names an
object that exists, without requiring <em><rev></em> to be a tag, and
without dereferencing <em><rev></em>; because a tag is already an object,
it does not have to be dereferenced even once to get to an object.</p></div>
<div class="paragraph"><p><em><rev>^{tag}</em> can be used to ensure that <em><rev></em> identifies an
existing tag object.</p></div>
</dd>
<dt class="hdlist1">
<em><rev>^{}</em>, e.g. <em>v0.99.8^{}</em>
</dt>
<dd>
<p>
A suffix <em>^</em> followed by an empty brace pair
means the object could be a tag,
and dereference the tag recursively until a non-tag object is
found.
</p>
</dd>
<dt class="hdlist1">
<em><rev>^{/<text>}</em>, e.g. <em>HEAD^{/fix nasty bug}</em>
</dt>
<dd>
<p>
A suffix <em>^</em> to a revision parameter, followed by a brace
pair that contains a text led by a slash,
is the same as the <em>:/fix nasty bug</em> syntax below except that
it returns the youngest matching commit which is reachable from
the <em><rev></em> before <em>^</em>.
</p>
</dd>
<dt class="hdlist1">
<em>:/<text></em>, e.g. <em>:/fix nasty bug</em>
</dt>
<dd>
<p>
A colon, followed by a slash, followed by a text, names
a commit whose commit message matches the specified regular expression.
This name returns the youngest matching commit which is
reachable from any ref, including HEAD.
The regular expression can match any part of the
commit message. To match messages starting with a string, one can use
e.g. <em>:/^foo</em>. The special sequence <em>:/!</em> is reserved for modifiers to what
is matched. <em>:/!-foo</em> performs a negative match, while <em>:/!!foo</em> matches a
literal <em>!</em> character, followed by <em>foo</em>. Any other sequence beginning with
<em>:/!</em> is reserved for now.
Depending on the given text, the shell’s word splitting rules might
require additional quoting.
</p>
</dd>
<dt class="hdlist1">
<em><rev>:<path></em>, e.g. <em>HEAD:README</em>, <em>master:./README</em>
</dt>
<dd>
<p>
A suffix <em>:</em> followed by a path names the blob or tree
at the given path in the tree-ish object named by the part
before the colon.
A path starting with <em>./</em> or <em>../</em> is relative to the current working directory.
The given path will be converted to be relative to the working tree’s root directory.
This is most useful to address a blob or tree from a commit or tree that has
the same tree structure as the working tree.
</p>
</dd>
<dt class="hdlist1">
<em>:[<n>:]<path></em>, e.g. <em>:0:README</em>, <em>:README</em>
</dt>
<dd>
<p>
A colon, optionally followed by a stage number (0 to 3) and a
colon, followed by a path, names a blob object in the
index at the given path. A missing stage number (and the colon
that follows it) names a stage 0 entry. During a merge, stage
1 is the common ancestor, stage 2 is the target branch’s version
(typically the current branch), and stage 3 is the version from
the branch which is being merged.
</p>
</dd>
</dl></div>
<div class="paragraph"><p>Here is an illustration, by Jon Loeliger. Both commit nodes B
and C are parents of commit node A. Parent commits are ordered
left-to-right.</p></div>
<div class="literalblock">
<div class="content">
<pre><code>G H I J
\ / \ /
D E F
\ | / \
\ | / |
\|/ |
B C
\ /
\ /
A</code></pre>
</div></div>
<div class="literalblock">
<div class="content">
<pre><code>A = = A^0
B = A^ = A^1 = A~1
C = = A^2
D = A^^ = A^1^1 = A~2
E = B^2 = A^^2
F = B^3 = A^^3
G = A^^^ = A^1^1^1 = A~3
H = D^2 = B^^2 = A^^^2 = A~2^2
I = F^ = B^3^ = A^^3^
J = F^2 = B^3^2 = A^^3^2</code></pre>
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_specifying_ranges">SPECIFYING RANGES</h2>
<div class="sectionbody">
<div class="paragraph"><p>History traversing commands such as <code>git log</code> operate on a set
of commits, not just a single commit.</p></div>
<div class="paragraph"><p>For these commands,
specifying a single revision, using the notation described in the
previous section, means the set of commits <code>reachable</code> from the given
commit.</p></div>
<div class="paragraph"><p>Specifying several revisions means the set of commits reachable from
any of the given commits.</p></div>
<div class="paragraph"><p>A commit’s reachable set is the commit itself and the commits in
its ancestry chain.</p></div>
<div class="paragraph"><p>There are several notations to specify a set of connected commits
(called a "revision range"), illustrated below.</p></div>
<div class="sect2">
<h3 id="_commit_exclusions">Commit Exclusions</h3>
<div class="dlist"><dl>
<dt class="hdlist1">
<em>^<rev></em> (caret) Notation
</dt>
<dd>
<p>
To exclude commits reachable from a commit, a prefix <em>^</em>
notation is used. E.g. <em>^r1 r2</em> means commits reachable
from <em>r2</em> but exclude the ones reachable from <em>r1</em> (i.e. <em>r1</em> and
its ancestors).
</p>
</dd>
</dl></div>
</div>
<div class="sect2">
<h3 id="_dotted_range_notations">Dotted Range Notations</h3>
<div class="dlist"><dl>
<dt class="hdlist1">
The <em>..</em> (two-dot) Range Notation
</dt>
<dd>
<p>
The <em>^r1 r2</em> set operation appears so often that there is a shorthand
for it. When you have two commits <em>r1</em> and <em>r2</em> (named according
to the syntax explained in SPECIFYING REVISIONS above), you can ask
for commits that are reachable from r2 excluding those that are reachable
from r1 by <em>^r1 r2</em> and it can be written as <em>r1..r2</em>.
</p>
</dd>
<dt class="hdlist1">
The <em>...</em> (three-dot) Symmetric Difference Notation
</dt>
<dd>
<p>
A similar notation <em>r1...r2</em> is called symmetric difference
of <em>r1</em> and <em>r2</em> and is defined as
<em>r1 r2 --not $(git merge-base --all r1 r2)</em>.
It is the set of commits that are reachable from either one of
<em>r1</em> (left side) or <em>r2</em> (right side) but not from both.
</p>
</dd>
</dl></div>
<div class="paragraph"><p>In these two shorthand notations, you can omit one end and let it default to HEAD.
For example, <em>origin..</em> is a shorthand for <em>origin..HEAD</em> and asks "What
did I do since I forked from the origin branch?" Similarly, <em>..origin</em>
is a shorthand for <em>HEAD..origin</em> and asks "What did the origin do since
I forked from them?" Note that <em>..</em> would mean <em>HEAD..HEAD</em> which is an
empty range that is both reachable and unreachable from HEAD.</p></div>
<div class="paragraph"><p>Commands that are specifically designed to take two distinct ranges
(e.g. "git range-diff R1 R2" to compare two ranges) do exist, but
they are exceptions. Unless otherwise noted, all "git" commands
that operate on a set of commits work on a single revision range.
In other words, writing two "two-dot range notation" next to each
other, e.g.</p></div>
<div class="literalblock">
<div class="content">
<pre><code>$ git log A..B C..D</code></pre>
</div></div>
<div class="paragraph"><p>does <strong>not</strong> specify two revision ranges for most commands. Instead
it will name a single connected set of commits, i.e. those that are
reachable from either B or D but are reachable from neither A or C.
In a linear history like this:</p></div>
<div class="literalblock">
<div class="content">
<pre><code>---A---B---o---o---C---D</code></pre>
</div></div>
<div class="paragraph"><p>because A and B are reachable from C, the revision range specified
by these two dotted ranges is a single commit D.</p></div>
</div>
<div class="sect2">
<h3 id="_other_lt_rev_gt_94_parent_shorthand_notations">Other <rev>^ Parent Shorthand Notations</h3>
<div class="paragraph"><p>Three other shorthands exist, particularly useful for merge commits,
for naming a set that is formed by a commit and its parent commits.</p></div>
<div class="paragraph"><p>The <em>r1^@</em> notation means all parents of <em>r1</em>.</p></div>
<div class="paragraph"><p>The <em>r1^!</em> notation includes commit <em>r1</em> but excludes all of its parents.
By itself, this notation denotes the single commit <em>r1</em>.</p></div>
<div class="paragraph"><p>The <em><rev>^-[<n>]</em> notation includes <em><rev></em> but excludes the <n>th
parent (i.e. a shorthand for <em><rev>^<n>..<rev></em>), with <em><n></em> = 1 if
not given. This is typically useful for merge commits where you
can just pass <em><commit>^-</em> to get all the commits in the branch
that was merged in merge commit <em><commit></em> (including <em><commit></em>
itself).</p></div>
<div class="paragraph"><p>While <em><rev>^<n></em> was about specifying a single commit parent, these
three notations also consider its parents. For example you can say
<em>HEAD^2^@</em>, however you cannot say <em>HEAD^@^2</em>.</p></div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_revision_range_summary">Revision Range Summary</h2>
<div class="sectionbody">
<div class="dlist"><dl>
<dt class="hdlist1">
<em><rev></em>
</dt>
<dd>
<p>
Include commits that are reachable from <rev> (i.e. <rev> and its
ancestors).
</p>
</dd>
<dt class="hdlist1">
<em>^<rev></em>
</dt>
<dd>
<p>
Exclude commits that are reachable from <rev> (i.e. <rev> and its
ancestors).
</p>
</dd>
<dt class="hdlist1">
<em><rev1>..<rev2></em>
</dt>
<dd>
<p>
Include commits that are reachable from <rev2> but exclude
those that are reachable from <rev1>. When either <rev1> or
<rev2> is omitted, it defaults to <code>HEAD</code>.
</p>
</dd>
<dt class="hdlist1">
<em><rev1>...<rev2></em>
</dt>
<dd>
<p>
Include commits that are reachable from either <rev1> or
<rev2> but exclude those that are reachable from both. When
either <rev1> or <rev2> is omitted, it defaults to <code>HEAD</code>.
</p>
</dd>
<dt class="hdlist1">
<em><rev>^@</em>, e.g. <em>HEAD^@</em>
</dt>
<dd>
<p>
A suffix <em>^</em> followed by an at sign is the same as listing
all parents of <em><rev></em> (meaning, include anything reachable from
its parents, but not the commit itself).
</p>
</dd>
<dt class="hdlist1">
<em><rev>^!</em>, e.g. <em>HEAD^!</em>
</dt>
<dd>
<p>
A suffix <em>^</em> followed by an exclamation mark is the same
as giving commit <em><rev></em> and all its parents prefixed with
<em>^</em> to exclude them (and their ancestors).
</p>
</dd>
<dt class="hdlist1">
<em><rev>^-<n></em>, e.g. <em>HEAD^-, HEAD^-2</em>
</dt>
<dd>
<p>
Equivalent to <em><rev>^<n>..<rev></em>, with <em><n></em> = 1 if not
given.
</p>
</dd>
</dl></div>
<div class="paragraph"><p>Here are a handful of examples using the Loeliger illustration above,
with each step in the notation’s expansion and selection carefully
spelt out:</p></div>
<div class="literalblock">
<div class="content">
<pre><code> Args Expanded arguments Selected commits
D G H D
D F G H I J D F
^G D H D
^D B E I J F B
^D B C E I J F B C
C I J F C
B..C = ^B C C
B...C = B ^F C G H D E B C
B^- = B^..B
= ^B^1 B E I J F B
C^@ = C^1
= F I J F
B^@ = B^1 B^2 B^3
= D E F D G H E F I J
C^! = C ^C^@
= C ^C^1
= C ^F C
B^! = B ^B^@
= B ^B^1 ^B^2 ^B^3
= B ^D ^E ^F B
F^! D = F ^I ^J D G H D F</code></pre>
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_parseopt">PARSEOPT</h2>
<div class="sectionbody">
<div class="paragraph"><p>In <code>--parseopt</code> mode, <em>git rev-parse</em> helps massaging options to bring to shell
scripts the same facilities C builtins have. It works as an option normalizer
(e.g. splits single switches aggregate values), a bit like <code>getopt(1)</code> does.</p></div>
<div class="paragraph"><p>It takes on the standard input the specification of the options to parse and
understand, and echoes on the standard output a string suitable for <code>sh(1)</code> <code>eval</code>
to replace the arguments with normalized ones. In case of error, it outputs
usage on the standard error stream, and exits with code 129.</p></div>
<div class="paragraph"><p>Note: Make sure you quote the result when passing it to <code>eval</code>. See
below for an example.</p></div>
<div class="sect2">
<h3 id="_input_format">Input Format</h3>
<div class="paragraph"><p><em>git rev-parse --parseopt</em> input format is fully text based. It has two parts,
separated by a line that contains only <code>--</code>. The lines before the separator
(should be one or more) are used for the usage.
The lines after the separator describe the options.</p></div>
<div class="paragraph"><p>Each line of options has this format:</p></div>
<div class="listingblock">
<div class="content">
<pre><code><opt-spec><flags>*<arg-hint>? SP+ help LF</code></pre>
</div></div>
<div class="dlist"><dl>
<dt class="hdlist1">
<code><opt-spec></code>
</dt>
<dd>
<p>
its format is the short option character, then the long option name
separated by a comma. Both parts are not required, though at least one
is necessary. May not contain any of the <code><flags></code> characters.
<code>h,help</code>, <code>dry-run</code> and <code>f</code> are examples of correct <code><opt-spec></code>.
</p>
</dd>
<dt class="hdlist1">
<code><flags></code>
</dt>
<dd>
<p>
<code><flags></code> are of <code>*</code>, <code>=</code>, <code>?</code> or <code>!</code>.
</p>
<div class="ulist"><ul>
<li>
<p>
Use <code>=</code> if the option takes an argument.
</p>
</li>
<li>
<p>
Use <code>?</code> to mean that the option takes an optional argument. You
probably want to use the <code>--stuck-long</code> mode to be able to
unambiguously parse the optional argument.
</p>
</li>
<li>
<p>
Use <code>*</code> to mean that this option should not be listed in the usage
generated for the <code>-h</code> argument. It’s shown for <code>--help-all</code> as
documented in <a href="gitcli.html">gitcli(7)</a>.
</p>
</li>
<li>
<p>
Use <code>!</code> to not make the corresponding negated long option available.
</p>
</li>
</ul></div>
</dd>
<dt class="hdlist1">
<code><arg-hint></code>
</dt>
<dd>
<p>
<code><arg-hint></code>, if specified, is used as a name of the argument in the
help output, for options that take arguments. <code><arg-hint></code> is
terminated by the first whitespace. It is customary to use a
dash to separate words in a multi-word argument hint.
</p>
</dd>
</dl></div>
<div class="paragraph"><p>The remainder of the line, after stripping the spaces, is used
as the help associated with the option.</p></div>
<div class="paragraph"><p>Blank lines are ignored, and lines that don’t match this specification are used
as option group headers (start the line with a space to create such
lines on purpose).</p></div>
</div>
<div class="sect2">
<h3 id="_example">Example</h3>
<div class="listingblock">
<div class="content">
<pre><code>OPTS_SPEC="\
some-command [<options>] <args>...
some-command does foo and bar!
--
h,help! show the help
foo some nifty option --foo
bar= some cool option --bar with an argument
baz=arg another cool option --baz with a named argument
qux?path qux may take a path argument but has meaning by itself
An option group Header
C? option C with an optional argument"
eval "$(echo "$OPTS_SPEC" | git rev-parse --parseopt -- "$@" || echo exit $?)"</code></pre>
</div></div>
</div>
<div class="sect2">
<h3 id="_usage_text">Usage text</h3>
<div class="paragraph"><p>When <code>"$@"</code> is <code>-h</code> or <code>--help</code> in the above example, the following
usage text would be shown:</p></div>
<div class="listingblock">
<div class="content">
<pre><code>usage: some-command [<options>] <args>...
some-command does foo and bar!
-h, --help show the help
--[no-]foo some nifty option --foo
--[no-]bar ... some cool option --bar with an argument
--[no-]baz <arg> another cool option --baz with a named argument
--[no-]qux[=<path>] qux may take a path argument but has meaning by itself
An option group Header
-C[...] option C with an optional argument</code></pre>
</div></div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_sq_quote">SQ-QUOTE</h2>
<div class="sectionbody">
<div class="paragraph"><p>In <code>--sq-quote</code> mode, <em>git rev-parse</em> echoes on the standard output a
single line suitable for <code>sh(1)</code> <code>eval</code>. This line is made by
normalizing the arguments following <code>--sq-quote</code>. Nothing other than
quoting the arguments is done.</p></div>
<div class="paragraph"><p>If you want command input to still be interpreted as usual by
<em>git rev-parse</em> before the output is shell quoted, see the <code>--sq</code>
option.</p></div>
<div class="sect2">
<h3 id="_example_2">Example</h3>
<div class="listingblock">
<div class="content">
<pre><code>$ cat >your-git-script.sh <<\EOF
#!/bin/sh
args=$(git rev-parse --sq-quote "$@") # quote user-supplied arguments
command="git frotz -n24 $args" # and use it inside a handcrafted
# command line
eval "$command"
EOF
$ sh your-git-script.sh "a b'c"</code></pre>
</div></div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_examples">EXAMPLES</h2>
<div class="sectionbody">
<div class="ulist"><ul>
<li>
<p>
Print the object name of the current commit:
</p>
<div class="listingblock">
<div class="content">
<pre><code>$ git rev-parse --verify HEAD</code></pre>
</div></div>
</li>
<li>
<p>
Print the commit object name from the revision in the $REV shell variable:
</p>
<div class="listingblock">
<div class="content">
<pre><code>$ git rev-parse --verify --end-of-options $REV^{commit}</code></pre>
</div></div>
<div class="paragraph"><p>This will error out if $REV is empty or not a valid revision.</p></div>
</li>
<li>
<p>
Similar to above:
</p>
<div class="listingblock">
<div class="content">
<pre><code>$ git rev-parse --default master --verify --end-of-options $REV</code></pre>
</div></div>
<div class="paragraph"><p>but if $REV is empty, the commit object name from master will be printed.</p></div>
</li>
</ul></div>
</div>
</div>
<div class="sect1">
<h2 id="_git">GIT</h2>
<div class="sectionbody">
<div class="paragraph"><p>Part of the <a href="git.html">git(1)</a> suite</p></div>
</div>
</div>
</div>
<div id="footnotes"><hr /></div>
<div id="footer">
<div id="footer-text">
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2024-03-28 14:36:08 PDT
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