Question

I work with different git identities, and since I sometimes manage to mix them up, is there a way to display this information when commiting?

Along the list of modified files.

Answer 1

As mentioned before, you can use the .git/hooks/prepare-commit-message git hook with such content:

 WHOAMI="# $(git config user.name) <$(git config user.email)>"
 echo "$WHOAMI" >> "$1"

This adds, at the end of the pre-formatted commit message, the line

# username <[e-mail]>

See man githooks and .git/hooks/prepare-commit-msg.sample for further information and examples.