git-difftool

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git-difftool(1) ===============

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.

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.

--rotate-to=<file>
Start showing the diff for \<file>, the paths before it will move to the end and output.

--skip-to=<file>
Start showing the diff for \<file>, skipping all the paths before it.

-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.

--symlinks

--no-symlinks
git difftool’s default behavior is to 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

--no-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. This may be selected automatically using the configuration variable difftool.guiDefault. The --no-gui option can be used to override these settings. If diff.guitool is not set, we will fallback in the order of merge.guitool, diff.tool, merge.tool until a tool is found.

--trust-exit-code

--no-trust-exit-code
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 for the full list of supported options.

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

Everything above this line in this section isn’t included from the [git-config](git-config.md) documentation. The content that follows is the same as what’s found there:

`diff.tool` Controls which diff tool is used by [git-difftool](git-difftool.md). This variable overrides the value configured in `merge.tool`. The list below shows the valid built-in values. Any other value is treated as a custom diff tool and requires that a corresponding `difftool..cmd` variable is defined. `diff.guitool` Controls which diff tool is used by [git-difftool](git-difftool.md) when the `-g`/`--gui` flag is specified. This variable overrides the value configured in `merge.guitool`. The list below shows the valid built-in values. Any other value is treated as a custom diff tool and requires that a corresponding `difftool..cmd` variable is defined. include {build_dir}/mergetools-diff.adoc\[\] `difftool..cmd` Specify the command to invoke the specified diff tool. The specified command is evaluated in shell 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. See the `--tool=` option in [git-difftool](git-difftool.md) for more details. `difftool..path` Override the path for the given tool. This is useful in case your tool is not in the PATH. `difftool.trustExitCode` Exit difftool if the invoked diff tool returns a non-zero exit status. See the `--trust-exit-code` option in [git-difftool](git-difftool.md) for more details. `difftool.prompt` Prompt before each invocation of the diff tool. `difftool.guiDefault` Set `true` to use the `diff.guitool` by default (equivalent to specifying the `--gui` argument), or `auto` to select `diff.guitool` or `diff.tool` depending on the presence of a `DISPLAY` environment variable value. The default is `false`, where the `--gui` argument must be provided explicitly for the `diff.guitool` to be used.

SEE ALSO -------- git-diff:: Show changes between commits, commit and working tree, etc

git-mergetool
Run merge conflict resolution tools to resolve merge conflicts

git-config
Get and set repository or global options

GIT --- Part of the git suite