# git-mergetool(1) Manual Page

## NAME

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

## SYNOPSIS

    git mergetool [--tool=<tool>] [-y | --[no-]prompt] [<file>…​]

## DESCRIPTION

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 (skipping those without conflicts). Specifying a directory will include all unresolved files in that path. If no <file> names are specified, git mergetool will run the merge tool program on every file with merge conflicts.

## OPTIONS

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

  Use the merge resolution program specified by <tool>. Valid values include emerge, gvimdiff, kdiff3, meld, vimdiff, and tortoisemerge. Run `git mergetool --tool-help` for the list of valid <tool> settings.

  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.

--tool-help

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

-y
--no-prompt

  Don’t prompt before each invocation of the merge resolution program. This is the default if the merge resolution program is explicitly specified with the `--tool` option or with the `merge.tool` configuration variable.

--prompt

  Prompt before each invocation of the merge resolution program to give the user a chance to skip the path.

-g
--gui

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

--no-gui

  This overrides a previous `-g` or `--gui` setting and reads the default merge tool will be read from the configured `merge.tool` variable.

-O<orderfile>

  Process files in the order specified in the <orderfile>, which has one shell glob pattern per line. This overrides the `diff.orderFile` configuration variable (see git-config(1)). To cancel `diff.orderFile`, use `-O/dev/null`.

## TEMPORARY FILES

`git mergetool` creates `*.orig` backup files while resolving merges. These are safe to remove once a file has been merged and its `git mergetool` session has completed.

Setting the `mergetool.keepBackup` configuration variable to `false` causes `git mergetool` to automatically remove the backup as files are successfully merged.

## GIT

Part of the git(1) suite