git-check-mailmap
(1)Show canonical names and email addresses of contacts
git check-mailmap [<options>] <contact>...
Options
3--stdinRead contacts, one per line, from the standard input after exhausting contacts provided on the command-line.
--mailmap-fileIn addition to any configured mailmap files, read the specified mailmap file. Entries in this file take precedence over entries in either the default mailmap file or any configured mailmap file.
--mailmap-blobLike --mailmap-file, but consider the value as a reference to a blob in the repository. If both --mailmap-file and --mailmap-blob are specified, entries in --mailmap-file will take precedence.