User and Process Information
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 who     Who is On?
 w       Who and what they Do?
 finger  Who is who?
 users   A horizontal list of who is logged in.
 ps      Process Status.
 last    The user log for the day.
 chpass  Change your fullname and/or login shell.
 sentry  Monitors login/logout account usage.
 uinfo   Display historical info on a user's account.
 notify  Important notices checked at login time.