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.TH "GIT-PATCH-ID" 1 "" "" ""
.SH NAME
git-patch-id \- Generate a patch ID
.SH "SYNOPSIS"


\fIgit\-patch\-id\fR < <patch>

.SH "DESCRIPTION"


A "patch ID" is nothing but a SHA1 of the diff associated with a patch, with whitespace and line numbers ignored\&. As such, it's "reasonably stable", but at the same time also reasonably unique, ie two patches that have the same "patch ID" are almost guaranteed to be the same thing\&.


IOW, you can use this thing to look for likely duplicate commits\&.


When dealing with git\-diff\-tree output, it takes advantage of the fact that the patch is prefixed with the object name of the commit, and outputs two 40\-byte hexadecimal string\&. The first string is the patch ID, and the second string is the commit ID\&. This can be used to make a mapping from patch ID to commit ID\&.

.SH "OPTIONS"

.TP
<patch>
The diff to create the ID of\&.

.SH "AUTHOR"


Written by Linus Torvalds <torvalds@osdl\&.org>

.SH "DOCUMENTATION"


Documentation by Junio C Hamano and the git\-list <git@vger\&.kernel\&.org>\&.

.SH "GIT"


Part of the \fBgit\fR(7) suite