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443<div id="header">
444<h1>git-merge-file(1) Manual Page</h1>
445<h2 id="_name">NAME</h2>
446<div class="sectionbody">
447<p>git-merge-file - Run a three-way file merge</p>
448</div>
449</div>
450<div id="content">
451<div class="sect1">
452<h2 id="_synopsis">SYNOPSIS</h2>
453<div class="sectionbody">
454<div class="verseblock">
455<pre class="content"><em>git merge-file</em> [-L &lt;current-name&gt; [-L &lt;base-name&gt; [-L &lt;other-name&gt;]]]
456 [--ours|--theirs|--union] [-p|--stdout] [-q|--quiet] [--marker-size=&lt;n&gt;]
457 [--[no-]diff3] [--object-id] &lt;current&gt; &lt;base&gt; &lt;other&gt;</pre>
458</div>
459</div>
460</div>
461<div class="sect1">
462<h2 id="_description">DESCRIPTION</h2>
463<div class="sectionbody">
464<div class="paragraph">
Junio C Hamanodc392382024-10-11 18:57:29465<p>Given three files <em>&lt;current&gt;</em>, <em>&lt;base&gt;</em> and <em>&lt;other&gt;</em>,
466<em>git merge-file</em> incorporates all changes that lead from <em>&lt;base&gt;</em>
467to <em>&lt;other&gt;</em> into <em>&lt;current&gt;</em>. The result ordinarily goes into
468<em>&lt;current&gt;</em>. <em>git merge-file</em> is useful for combining separate changes
469to an original. Suppose <em>&lt;base&gt;</em> is the original, and both
470<em>&lt;current&gt;</em> and <em>&lt;other&gt;</em> are modifications of <em>&lt;base&gt;</em>,
Junio C Hamanob96f40a2024-08-01 00:57:25471then <em>git merge-file</em> combines both changes.</p>
472</div>
473<div class="paragraph">
Junio C Hamanodc392382024-10-11 18:57:29474<p>A conflict occurs if both <em>&lt;current&gt;</em> and <em>&lt;other&gt;</em> have changes
Junio C Hamanob96f40a2024-08-01 00:57:25475in a common segment of lines. If a conflict is found, <em>git merge-file</em>
476normally outputs a warning and brackets the conflict with lines containing
477&lt;&lt;&lt;&lt;&lt;&lt;&lt; and &gt;&gt;&gt;&gt;&gt;&gt;&gt; markers. A typical conflict will look like this:</p>
478</div>
479<div class="literalblock">
480<div class="content">
481<pre>&lt;&lt;&lt;&lt;&lt;&lt;&lt; A
482lines in file A
483=======
484lines in file B
485&gt;&gt;&gt;&gt;&gt;&gt;&gt; B</pre>
486</div>
487</div>
488<div class="paragraph">
489<p>If there are conflicts, the user should edit the result and delete one of
490the alternatives. When <code>--ours</code>, <code>--theirs</code>, or <code>--union</code> option is in effect,
Junio C Hamanodc392382024-10-11 18:57:29491however, these conflicts are resolved favouring lines from <em>&lt;current&gt;</em>,
492lines from <em>&lt;other&gt;</em>, or lines from both respectively. The length of the
Junio C Hamanob96f40a2024-08-01 00:57:25493conflict markers can be given with the <code>--marker-size</code> option.</p>
494</div>
495<div class="paragraph">
496<p>If <code>--object-id</code> is specified, exactly the same behavior occurs, except that
497instead of specifying what to merge as files, it is specified as a list of
498object IDs referring to blobs.</p>
499</div>
500<div class="paragraph">
501<p>The exit value of this program is negative on error, and the number of
502conflicts otherwise (truncated to 127 if there are more than that many
503conflicts). If the merge was clean, the exit value is 0.</p>
504</div>
505<div class="paragraph">
506<p><em>git merge-file</em> is designed to be a minimal clone of RCS <em>merge</em>; that is, it
507implements all of RCS <em>merge</em>'s functionality which is needed by
508<a href="git.html">git(1)</a>.</p>
509</div>
510</div>
511</div>
512<div class="sect1">
513<h2 id="_options">OPTIONS</h2>
514<div class="sectionbody">
515<div class="dlist">
516<dl>
517<dt class="hdlist1">--object-id</dt>
518<dd>
519<p>Specify the contents to merge as blobs in the current repository instead of
520files. In this case, the operation must take place within a valid repository.</p>
521<div class="paragraph">
522<p>If the <code>-p</code> option is specified, the merged file (including conflicts, if any)
523goes to standard output as normal; otherwise, the merged file is written to the
524object store and the object ID of its blob is written to standard output.</p>
525</div>
526</dd>
527<dt class="hdlist1">-L &lt;label&gt;</dt>
528<dd>
529<p>This option may be given up to three times, and
530specifies labels to be used in place of the
531corresponding file names in conflict reports. That is,
Junio C Hamanodc392382024-10-11 18:57:29532<code>git</code> <code>merge-file</code> <code>-L</code> <code>x</code> <code>-L</code> <code>y</code> <code>-L</code> <code>z</code> <code>a</code> <code>b</code> <code>c</code> generates output that
Junio C Hamanob96f40a2024-08-01 00:57:25533looks like it came from files x, y and z instead of
534from files a, b and c.</p>
535</dd>
536<dt class="hdlist1">-p</dt>
537<dd>
538<p>Send results to standard output instead of overwriting
Junio C Hamanodc392382024-10-11 18:57:29539<em>&lt;current&gt;</em>.</p>
Junio C Hamanob96f40a2024-08-01 00:57:25540</dd>
541<dt class="hdlist1">-q</dt>
542<dd>
543<p>Quiet; do not warn about conflicts.</p>
544</dd>
545<dt class="hdlist1">--diff3</dt>
546<dd>
547<p>Show conflicts in "diff3" style.</p>
548</dd>
549<dt class="hdlist1">--zdiff3</dt>
550<dd>
551<p>Show conflicts in "zdiff3" style.</p>
552</dd>
553<dt class="hdlist1">--ours</dt>
554<dt class="hdlist1">--theirs</dt>
555<dt class="hdlist1">--union</dt>
556<dd>
557<p>Instead of leaving conflicts in the file, resolve conflicts
558favouring our (or their or both) side of the lines.</p>
559</dd>
560<dt class="hdlist1">--diff-algorithm={patience|minimal|histogram|myers}</dt>
561<dd>
562<p>Use a different diff algorithm while merging. The current default is "myers",
563but selecting more recent algorithm such as "histogram" can help
564avoid mismerges that occur due to unimportant matching lines
565(such as braces from distinct functions). See also
566<a href="git-diff.html">git-diff(1)</a> <code>--diff-algorithm</code>.</p>
567</dd>
568</dl>
569</div>
570</div>
571</div>
572<div class="sect1">
573<h2 id="_examples">EXAMPLES</h2>
574<div class="sectionbody">
575<div class="dlist">
576<dl>
Junio C Hamanodc392382024-10-11 18:57:29577<dt class="hdlist1"><code>git</code> <code>merge-file</code> <code>README.my</code> <code>README</code> <code>README.upstream</code></dt>
Junio C Hamanob96f40a2024-08-01 00:57:25578<dd>
579<p>combines the changes of README.my and README.upstream since README,
580tries to merge them and writes the result into README.my.</p>
581</dd>
Junio C Hamanodc392382024-10-11 18:57:29582<dt class="hdlist1"><code>git</code> <code>merge-file</code> <code>-L</code> <code>a</code> <code>-L</code> <code>b</code> <code>-L</code> <code>c</code> <code>tmp/a123</code> <code>tmp/b234</code> <code>tmp/c345</code></dt>
Junio C Hamanob96f40a2024-08-01 00:57:25583<dd>
584<p>merges tmp/a123 and tmp/c345 with the base tmp/b234, but uses labels
585<code>a</code> and <code>c</code> instead of <code>tmp/a123</code> and <code>tmp/c345</code>.</p>
586</dd>
Junio C Hamanodc392382024-10-11 18:57:29587<dt class="hdlist1"><code>git</code> <code>merge-file</code> <code>-p</code> <code>--object-id</code> <code>abc1234</code> <code>def567</code> <code>890abcd</code></dt>
Junio C Hamanob96f40a2024-08-01 00:57:25588<dd>
589<p>combines the changes of the blob abc1234 and 890abcd since def567,
590tries to merge them and writes the result to standard output</p>
591</dd>
592</dl>
593</div>
594</div>
595</div>
596<div class="sect1">
597<h2 id="_git">GIT</h2>
598<div class="sectionbody">
599<div class="paragraph">
600<p>Part of the <a href="git.html">git(1)</a> suite</p>
601</div>
602</div>
603</div>
604</div>
605<div id="footer">
606<div id="footer-text">
Junio C Hamano1cc68cc2025-08-04 16:37:24607Last updated 2025-06-20 18:10:42 -0700
Junio C Hamanob96f40a2024-08-01 00:57:25608</div>
609</div>
610</body>
611</html>