Name
who
Synopsis
who [options
] [file
]
Displays information about the current status of the system. With no options, lists the names of users currently logged into the system. An optional system file (default is /var/run/utmp) can be supplied to give additional information. who is usually invoked without options, but useful options include am i and -u. For more examples, see cut , line, paste , tee , and wc .
Options
- -H
Print headings.
- -m
Report only about the current terminal.
- =q
List names and number of users in columns.
- -T
Report whether terminals are writable (
+
), not writable (-
), or unknown (?
).- -u
Report terminal usage (idle time). A dot (.) means less than one minute idle; old means more than 24 hours idle.
- am i
Print the username of the invoking user. (Similar to results from id.)
Example
This sample output was produced at 1:55 p.m. on January 15:
$ who -uH
USER LINE WHEN IDLE FROM
chuck console Jan 14 19:55 18:01
chuck ttyp1 Jan 15 13:11 .
chuck ttyp2 Jan 15 13:55 .
The output shows that the user chuck has been idle for 18 hours and 1 minute (18:01, under the IDLE column).
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