rev-parse: --show-cdup

When --show-prefix is useful, sometimes it is easier to cd up to
the toplevel of the tree.  This is equivalent to:

    git rev-parse --show-prefix | sed -e 's|[^/][^/]*|..|g'

but we do not have to invoke sed for that.

Signed-off-by: Junio C Hamano <junkio@cox.net>

1 files changed, 6 insertions, 1 deletions

diff --git a/Documentation/git-rev-parse.txt b/Documentation/git-rev-parse.txt
index 431b8f6e06..d638bfc202 100644
--- a/Documentation/git-rev-parse.txt
+++ b/Documentation/git-rev-parse.txt
@@ -68,10 +68,15 @@ OPTIONS
 	Show all refs found in `$GIT_DIR/refs`.
 
 --show-prefix::
-	When the command is invoked from a directory show the
+	When the command is invoked from a subdirectory, show the
 	path of the current directory relative to the top-level
 	directory.
 
+--show-cdup::
+	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).
+
 --since=datestring, --after=datestring::
 	Parses the date string, and outputs corresponding
 	--max-age= parameter for git-rev-list command.