SYNOPSIS
--------
[verse]
-'git patch-id' [--stable | --unstable] < <patch>
+'git patch-id' [--stable | --unstable]
DESCRIPTION
-----------
+Read a patch from the standard input and compute the patch ID for it.
+
A "patch ID" is nothing but a sum of SHA-1 of the file diffs associated with a
patch, with whitespace and line numbers ignored. As such, it's "reasonably
stable", but at the same time also reasonably unique, i.e., two patches that