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GIT-MERGETOOL(1) Git Manual GIT-MERGETOOL(1)
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. If
merge.guitool is not set, we will fallback to the tool configured under 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.
CONFIGURATION
mergetool.<tool>.path
Override the path for the given tool. This is useful in case your tool is not in the
PATH.
mergetool.<tool>.cmd
Specify the command to invoke the specified merge tool. The specified command is
evaluated in shell with the following variables available: BASE is the name of a
temporary file containing the common base of the files to be merged, if available;
LOCAL is the name of a temporary file containing the contents of the file on the
current branch; REMOTE is the name of a temporary file containing the contents of the
file from the branch being merged; MERGED contains the name of the file to which the
merge tool should write the results of a successful merge.
mergetool.<tool>.hideResolved
Allows the user to override the global mergetool.hideResolved value for a specific
tool. See mergetool.hideResolved for the full description.
mergetool.<tool>.trustExitCode
For a custom merge command, specify whether the exit code of the merge command can be
used to determine whether the merge was successful. If this is not set to true then
the merge target file timestamp is checked and the merge assumed to have been
successful if the file has been updated, otherwise the user is prompted to indicate
the success of the merge.
mergetool.meld.hasOutput
Older versions of meld do not support the --output option. Git will attempt to detect
whether meld supports --output by inspecting the output of meld --help. Configuring
mergetool.meld.hasOutput will make Git skip these checks and use the configured value
instead. Setting mergetool.meld.hasOutput to true tells Git to unconditionally use the
--output option, and false avoids using --output.
mergetool.meld.useAutoMerge
When the --auto-merge is given, meld will merge all non-conflicting parts
automatically, highlight the conflicting parts and wait for user decision. Setting
mergetool.meld.useAutoMerge to true tells Git to unconditionally use the --auto-merge
option with meld. Setting this value to auto makes git detect whether --auto-merge is
supported and will only use --auto-merge when available. A value of false avoids using
--auto-merge altogether, and is the default value.
mergetool.hideResolved
During a merge Git will automatically resolve as many conflicts as possible and write
the MERGED file containing conflict markers around any conflicts that it cannot
resolve; LOCAL and REMOTE normally represent the versions of the file from before
Git's conflict resolution. This flag causes LOCAL and REMOTE to be overwriten so that
only the unresolved conflicts are presented to the merge tool. Can be configured
per-tool via the mergetool.<tool>.hideResolved configuration variable. Defaults to
false.
mergetool.keepBackup
After performing a merge, the original file with conflict markers can be saved as a
file with a .orig extension. If this variable is set to false then this file is not
preserved. Defaults to true (i.e. keep the backup files).
mergetool.keepTemporaries
When invoking a custom merge tool, Git uses a set of temporary files to pass to the
tool. If the tool returns an error and this variable is set to true, then these
temporary files will be preserved, otherwise they will be removed after the tool has
exited. Defaults to false.
mergetool.writeToTemp
Git writes temporary BASE, LOCAL, and REMOTE versions of conflicting files in the
worktree by default. Git will attempt to use a temporary directory for these files
when set true. Defaults to false.
mergetool.prompt
Prompt before each invocation of the merge resolution program.
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
Git 2.34.1 05/20/2024 GIT-MERGETOOL(1)
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