Show information about the terminal attached to standard input only.
-q
""Quick mode"": List the names and number of logged in users in columns. All other command line options are ignored.
-s
Show the name, line and time fields only. This is the default.
-T
Indicate whether each user is accepting messages. One of the following characters is written:
+
User is accepting messages.
-
User is not accepting messages.
?
An error occurred.
-u
Show idle time for each user in hours and minutes as hh: mm, ‘.’ if the user has been idle less that a minute, and "old" if the user has been idle more than 24 hours.
am I
Equivalent to -m .
By default, who gathers information from the file /var/run/utmp. An alternate file may be specified which is usually /var/log/wtmp (or /var/log/wtmp.[0-6] depending on site policy as wtmp can grow quite large and daily versions may or may not be kept around after compression by ac(8)). The wtmp file contains a record of every login, logout, crash, shutdown and date change since wtmp was last truncated or created.
If /var/log/wtmp is being used as the file, the user name may be empty or one of the special characters ’|’, ’}’ and ’~’. Logouts produce an output line without any user name. For more information on the special characters, see utmp(5).
