# git-difftool(1) Manual Page

## NAME

git-difftool - Show changes using common diff tools

## SYNOPSIS

git difftool [<options>] <commit>{0,2} [--] [<path>…]

## DESCRIPTION

git difftool is a git command that allows you to compare and edit files between revisions using common diff tools. git difftool is a frontend to git diff and accepts the same options and arguments.

## OPTIONS

-y
--no-prompt

  Do not prompt before launching a diff tool.

--prompt

  Prompt before each invocation of the diff tool. This is the default behaviour; the option is provided to override any configuration settings.

-t <tool>
--tool=<tool>

  Use the diff tool specified by <tool>. Valid merge tools are: kdiff3, kompare, tkdiff, meld, xxdiff, emerge, vimdiff, gvimdiff, ecmerge, diffuse, opendiff, p4merge and araxis.

  If a diff tool is not specified, git difftool will use the configuration variable `diff.tool`. If the configuration variable `diff.tool` is not set, git difftool will pick a suitable default.

  You can explicitly provide a full path to the tool by setting the configuration variable `difftool.<tool>.path`. For example, you can configure the absolute path to kdiff3 by setting `difftool.kdiff3.path`. Otherwise, git difftool assumes the tool is available in PATH.

  Instead of running one of the known diff tools, git difftool can be customized to run an alternative program by specifying the command line to invoke in a configuration variable `difftool.<tool>.cmd`.

  When git difftool is invoked with this tool (either through the `-t` or `--tool` option or the `diff.tool` configuration variable) the configured command line will be invoked with the following variables available: `$LOCAL` is set to the name of the temporary file containing the contents of the diff pre-image and `$REMOTE` is set to the name of the temporary file containing the contents of the diff post-image. `$MERGED` is the name of the file which is being compared. `$BASE` is provided for compatibility with custom merge tool commands and has the same value as `$MERGED`.

-x <command>
--extcmd=<command>

  Specify a custom command for viewing diffs. git-difftool ignores the configured defaults and runs `$command $LOCAL $REMOTE` when this option is specified. Additionally, `$BASE` is set in the environment.

-g
--gui

  When git-difftool is invoked with the `-g` or `--gui` option the default diff tool will be read from the configured `diff.guitool` variable instead of `diff.tool`.

See git-diff(1) for the full list of supported options.

## CONFIG VARIABLES

git difftool falls back to git mergetool config variables when the difftool equivalents have not been defined.

diff.tool

  The default diff tool to use.

diff.guitool

  The default diff tool to use when `--gui` is specified.

difftool.<tool>.path

  Override the path for the given tool. This is useful in case your tool is not in the PATH.

difftool.<tool>.cmd

  Specify the command to invoke the specified diff tool.

  See the `--tool=<tool>` option above for more details.

difftool.prompt

  Prompt before each invocation of the diff tool.

## SEE ALSO

git-diff(1)

  Show changes between commits, commit and working tree, etc

git-mergetool(1)

  Run merge conflict resolution tools to resolve merge conflicts

git-config(1)

  Get and set repository or global options

## AUTHOR

Written by David Aguilar <davvid@gmail.com>.

## Documentation

Documentation by David Aguilar and the git-list <git@vger.kernel.org>.

## GIT

Part of the git(1) suite