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