1git-patch-id(1) 2=============== 3 4NAME 5---- 6git-patch-id - Compute unique ID for a patch 7 8SYNOPSIS 9-------- 10'git patch-id' < <patch> 11 12DESCRIPTION 13----------- 14A "patch ID" is nothing but a SHA1 of the diff associated with a patch, with 15whitespace and line numbers ignored. As such, it's "reasonably stable", but at 16the same time also reasonably unique, i.e., two patches that have the same "patch 17ID" are almost guaranteed to be the same thing. 18 19IOW, you can use this thing to look for likely duplicate commits. 20 21When dealing with 'git diff-tree' output, it takes advantage of 22the fact that the patch is prefixed with the object name of the 23commit, and outputs two 40-byte hexadecimal strings. The first 24string is the patch ID, and the second string is the commit ID. 25This can be used to make a mapping from patch ID to commit ID. 26 27OPTIONS 28------- 29<patch>:: 30 The diff to create the ID of. 31 32Author 33------ 34Written by Linus Torvalds <torvalds@osdl.org> 35 36Documentation 37-------------- 38Documentation by Junio C Hamano and the git-list <git@vger.kernel.org>. 39 40GIT 41--- 42Part of the linkgit:git[1] suite