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`. If
	`merge.guitool` is not set, we will fallback to the tool
	configured under `merge.tool`. This may be autoselected using
	the configuration variable `mergetool.guiDefault`.

`--no-gui`::
	This overrides a previous `-g` or `--gui` setting or
	`mergetool.guiDefault` configuration and reads the default merge
	tool 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 linkgit:git-config[1]).  To cancel `diff.orderFile`,
	use `-O/dev/null`.

CONFIGURATION
-------------
:git-mergetool: 1

include::includes/cmd-config-section-all.adoc[]

include::config/mergetool.adoc[]

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 files as files
are successfully merged.

BACKEND SPECIFIC HINTS
----------------------

vimdiff
~~~~~~~
include::mergetools/vimdiff.adoc[]

GIT
---
Part of the linkgit:git[1] suite