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If a filename argument is given, the named file is examined instead of /etc/utmp. Typically the named file is /var/adm/wtmp, which contains a record of all logins since it was created. In this case, who lists logins, logouts, and crashes. Each login is listed with user name, terminal name (with /dev/ suppressed), and date and time. Logouts produce a similar line without a user name. Reboots produce a line with `~' in place of the device name, and a fossil time indicating when the system went down. Finally, the adjacent pair of entries `|' and `}' indicate the system-maintained time just before and after a date command changed the system's idea of the time.
With two arguments, as in `who am i' (and also `who is who'), who tells who you are logged in as: it displays your hostname, login name, terminal name, and login time.
example% who am i example!ralph ttyp0 Apr 27 11:24 example% example% who mktg ttym0 Apr 27 11:11 gwen ttyp0 Apr 27 11:25 ralph ttyp1 Apr 27 11:30 example%
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