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Notifyme is a program that listen in background for users login, and report on login and logout. Users can be specified from a list or in a ~/notify.rc file. -C options force to display messages on the center of the screen.See man notifyme for more details. Part of notifyme package, tested on Debian.
There are 2 alternatives - vote for the best!
If you can do better, submit your command here.
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Interesting command, but you can ditch the UUOC:
notifyme -C $(cut -d: -f1 /etc/passwd)
Guessing that "UUOC" stands for "unnecessary use of cat" here.