git-mergetool - Run merge conflict resolution tools to resolve merge conflicts
git mergetool [--tool=<tool>] [<file>]…
Use git mergetool to run one of several merge utilities to resolve merge conflicts. It is typically run after git-merge.
If one or more <file> parameters are given, the merge tool program will be run to resolve differences on each file. If no <file> names are specified, git-mergetool will run the merge tool program on every file with merge conflicts.
Use the merge resolution program specified by <tool>. Valid merge tools are: kdiff3, tkdiff, meld, xxdiff, emerge, vimdiff, gvimdiff, ecmerge, and opendiff
If a merge resolution program is not specified, git-mergetool will use the configuration variable merge.tool. If the configuration variable merge.tool is not set, git-mergetool will pick a suitable default.
You can explicitly provide a full path to the tool by setting the configuration variable mergetool.<tool>.path. For example, you can configure the absolute path to kdiff3 by setting mergetool.kdiff3.path. Otherwise, git-mergetool assumes the tool is available in PATH.
Instead of running one of the known merge tool programs, git-mergetool can be customized to run an alternative program by specifying the command line to invoke in a configuration variable mergetool.<tool>.cmd.
When git-mergetool is invoked with this tool (either through the -t or --tool option or the merge.tool configuration variable) the configured command line will be invoked with $BASE set to the name of a temporary file containing the common base for the merge, if available; $LOCAL set to the name of a temporary file containing the contents of the file on the current branch; $REMOTE set to the name of a temporary file containing the contents of the file to be merged, and $MERGED set to the name of the file to which the merge tool should write the result of the merge resolution.
If the custom merge tool correctly indicates the success of a merge resolution with its exit code, then the configuration variable mergetool.<tool>.trustExitCode can be set to true. Otherwise, git-mergetool will prompt the user to indicate the success of the resolution after the custom tool has exited.
Written by Theodore Y Ts’o <email@example.com>
Documentation by Theodore Y Ts’o.
Part of the git(1) suite