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DESCRIPTION

The options are as follows:

-a

Equivalent to -bTu, with the exception that output is not restricted to the time and date of the last system reboot.

-b

Write the time and date of the last system reboot.

-H

Write column headings above the output.

-m

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 than 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/utx.active. An alternate file may be specified which is usually /var/log/utx.log (or /var/log/utx.log.[0-6] depending on site policy as utx.log can grow quite large and daily versions may or may not be kept around after compression by ac(8)). The utx.log file contains a record of every login, logout, crash, shutdown and date change since utx.log was last truncated or created.

If /var/log/utx.log 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 getutxent(3).