The 'who' command

'who' prints the following information for each user currently logged on: login name, terminal line, login time, remote hostname or X display. Example :

elric    tty1     Dec  8 12:36
tycho    ttyp3    Dec 10 08:50 (venus45.student1)
sly      ttyp5    Dec 10 08:43 (venus43.student1)
dart     ttyp7    Dec 10 09:14 (venus34.student1)
duke     ttyp9    Dec 10 10:06 (intel38.ece.ul.i)
hartye   ttypb    Dec 10 09:37 (nebulus.csn.ul.i)
ger      ttypa    Dec 10 09:04 (irgaslan.apcc.co)
stephen  ttypc    Dec 10 09:39 (intel43.ece.ul.i)
superant ttypd    Dec 10 10:07 (136.201.32.11)
stephen  ttypf    Dec 10 09:48 (intel43.ece.ul.i)
ulgsoc   ttype    Dec 10 09:51 (skylark.isocor.i)
tycho    ttyq1    Dec 10 09:18 (venus45.student1)
elric    ttyq8    Dec  9 18:22 (:0.0)

Usage:
'who'