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    <p><a href="http://git.kernel.org/?p=git/git.git;a=blob;f=diff.c;h=8f4815bfd7d798f2a99131cd2e79155e933c7876;hb=HEAD#l2002"><code>builtin_diff()</code></a><sup>1</sup> calls <a href="http://git.kernel.org/?p=git/git.git;a=blob;f=diff.c;h=8f4815bfd7d798f2a99131cd2e79155e933c7876;hb=HEAD#l1942"><code>diff_filespec_is_binary()</code></a> which calls <a href="http://git.kernel.org/?p=git/git.git;a=blob;f=xdiff-interface.c;h=0e2c169227ad29b5bf546c6c1b97e1a1d8ed7409;hb=HEAD#l241"><code>buffer_is_binary()</code></a> which checks for any occurrence of a zero byte (NUL “character”) in the first 8000 bytes (or the entire length if shorter).</p> <p>I do not see that this “is it binary?” test is explicitly exposed in any command though.</p> <p><code>git merge-file</code> directly uses <code>buffer_is_binary()</code>, so you may be able to make use of it:</p> <pre><code>git merge-file /dev/null /dev/null file-to-test </code></pre> <p>It seems to produce the error message like <code>error: Cannot merge binary files: file-to-test</code> and yields an exit status of 255 when given a binary file. I am not sure I would want to rely on this behavior though.</p> <p>Maybe <code>git diff --numstat</code> would be more reliable:</p> <pre><code>isBinary() { p=$(printf '%s\t-\t' -) t=$(git diff --no-index --numstat /dev/null "$1") case "$t" in "$p"*) return 0 ;; esac return 1 } isBinary file-to-test &amp;&amp; echo binary || echo not binary </code></pre> <p>For binary files, the <code>--numstat</code> output should start with <code>-</code> TAB <code>-</code> TAB, so we just test for that.</p> <hr> <p><sup>1</sup> <code>builtin_diff()</code> has strings like <code>Binary files %s and %s differ</code> that should be familiar.</p>
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    1. POHow to determine if Git handles a file as binary or as text?
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    1. COOn cygwin (Windows), /dev/null does not exist. One has to use the magic SHA1 brought up by Seth. `git diff --numstat 4b825dc642cb6eb9a060e54bf8d69288fbee4904 HEAD -- "$1"`.
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