Did you know about finger and its accompanying program chfn? It feels like a relic from a different time.
Usage:
chfn [options] [<username>]
Change your finger information.
Options:
-f, --full-name <full-name> real name
-o, --office <office> office number
-p, --office-phone <phone> office phone number
-h, --home-phone <phone> home phone number
-u, --help display this help
-V, --version display version
For more details see chfn(1).
finger, yes, but IIRC I just manually edited a .finger file - I don't remember chfn.
Also, I haven't used finger in such a long time; since soon after the eternal September, probably. So many contacts never had finger info, it became not worth the effort to even check for it.