git-difftool(1)

# git-difftool(1) Manual Page

## NAME

git-difftool - Show changes using common diff tools

## SYNOPSIS

    git difftool [<options>] [<commit> [<commit>]] [--] [<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. See git-diff(1).

## OPTIONS

-d
--dir-diff

  Copy the modified files to a temporary location and perform a directory diff on them. This mode never prompts before launching the diff tool.

-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 values include emerge, kompare, meld, and vimdiff. Run `git difftool --tool-help` for the list of valid <tool> settings.

  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`.

--tool-help

  Print a list of diff tools that may be used with `--tool`.

--[no-]symlinks

  git difftool's default behavior is create symlinks to the working tree when run in `--dir-diff` mode and the right-hand side of the comparison yields the same content as the file in the working tree.

  Specifying `--no-symlinks` instructs git difftool to create copies instead. `--no-symlinks` is the default on Windows.

-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`.

--[no-]trust-exit-code

  git-difftool invokes a diff tool individually on each file. Errors reported by the diff tool are ignored by default. Use `--trust-exit-code` to make git-difftool exit when an invoked diff tool returns a non-zero exit code.

  git-difftool will forward the exit code of the invoked tool when --trust-exit-code is used.

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.

difftool.trustExitCode

  Exit difftool if the invoked diff tool returns a non-zero exit status.

  See the `--trust-exit-code` option above for more details.

## 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

## GIT

Part of the git(1) suite