Impersonate people in git

add-to-your-HOME.gitconfig

;; Add this, if you want, to the bottom of your $HOME/.gitconfig.

;; Impersonate people: add personages (like the 3 below here); then say 
;;   $ git impersonate bob
;; Now, git thinks you are Bob (locally of course).  This is good for helping
;; your team do git surgery on a branch (and retain the credit for the original
;; person's work). Don't forget to set yourself back (unmask) when you are done.
;;   $ git impersonate me
;;
[user-me]
	name = Joe Blow
	email = [email protected]
[user-rick]
	name = Rick Sharky
	email = [email protected]
[user-bob]
	name = Robert Young
	email = [email protected]
; Template for adding a user: copy the following 3 lines above, uncomment and fill in.
; [user-]
; 	name = 
; 	email = 
[alias]
        whoami = "!f() { git config user.name && git config user.email; }; f"
        impersonate = "!f() { git config user.name \"$(git config user-$1.name)\" && git config user.email \"$(git config user-$1.email)\" && git whoami; }; f"