git-check-mailmap(1)

git-check-mailmap1

Show canonical names and email addresses of contacts

Usage

git check-mailmap [<options>] <contact> ...

Overview

For each “Name <user@host>”, “<user@host>”, or “user@host” from the command-line or standard input (when using --stdin), look up the person’s canonical name and email address (see "Mapping Authors" below). If found, print them; otherwise print the input as-is.

Options

--stdin

Read contacts, one per line, from the standard input after exhausting contacts provided on the command-line.

--mailmap-file=<file>

In 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-blob=<blob>

Like --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.

Output

For each contact, a single line is output, terminated by a newline. If the name is provided or known to the mailmap, “Name <user@host>” is printed; otherwise only “<user@host>” is printed.

Configuration

See mailmap.file and mailmap.blob in git-config(1) for how to specify a custom .mailmap target file or object.

Mapping authors

See gitmailmap(5).

Git

Part of the git(1) suite

Releases

7 releases since Debian 8 (Jessie); the text changed 6 times.

  1. 8
  2. 9
  3. 10
  4. 11
  5. 12
  6. 13
  7. Arch

--mailmap-blob since Debian 13 (Trixie); --mailmap-file since Debian 13 (Trixie).

From git 2.56.0-1 in Arch Linux 2026-11-01. Parsed by carta from the page's man source.