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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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