From: utzoo!henry
Newsgroups: hacknews
Title: df login 
Article-I.D.: utzoo.2824
Posted: Tue Feb 15 17:53:32 1983
Received: Tue Feb 15 17:53:32 1983

New system login, analogous to "who" and "termtest":  "df" prints
(after some delay, it's not fast) free space on the various filesystems.