'\" t .\" Title: git-patch-id .\" Author: [FIXME: author] [see http://docbook.sf.net/el/author] .\" Generator: DocBook XSL Stylesheets v1.76.1 <http://docbook.sf.net/> .\" Date: 02/24/2014 .\" Manual: Git Manual .\" Source: Git 1.9.0 .\" Language: English .\" .TH "GIT\-PATCH\-ID" "1" "02/24/2014" "Git 1\&.9\&.0" "Git Manual" .\" ----------------------------------------------------------------- .\" * Define some portability stuff .\" ----------------------------------------------------------------- .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .\" http://bugs.debian.org/507673 .\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .ie \n(.g .ds Aq \(aq .el .ds Aq ' .\" ----------------------------------------------------------------- .\" * set default formatting .\" ----------------------------------------------------------------- .\" disable hyphenation .nh .\" disable justification (adjust text to left margin only) .ad l .\" ----------------------------------------------------------------- .\" * MAIN CONTENT STARTS HERE * .\" ----------------------------------------------------------------- .SH "NAME" git-patch-id \- Compute unique ID for a patch .SH "SYNOPSIS" .sp .nf \fIgit patch\-id\fR < <patch> .fi .sp .SH "DESCRIPTION" .sp A "patch ID" is nothing but a SHA\-1 of the diff associated with a patch, with whitespace and line numbers ignored\&. As such, it\(cqs "reasonably stable", but at the same time also reasonably unique, i\&.e\&., two patches that have the same "patch ID" are almost guaranteed to be the same thing\&. .sp IOW, you can use this thing to look for likely duplicate commits\&. .sp When dealing with \fIgit diff\-tree\fR 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 strings\&. 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" .PP <patch> .RS 4 The diff to create the ID of\&. .RE .SH "GIT" .sp Part of the \fBgit\fR(1) suite