Who command: prints a list of currently logged in users.

Sun Solaris offers different command to find out who is logged on to a Solaris system.

Following list summaries command name according to a task:

a) Display current process information for each FTP Server user. Type the following commands

$ ftpwho
$ ftpcount

b) Find out who is on the system
Displays list of users (user’s name), terminal, login name, elapsed time since activity occurred on the line, and the process-ID of the command interpreter (shell) for each current UNIX system user.

$ who
$ who -b
$ who -r

Where,

• -b : Indicates the time and date of the last reboot.
• -r : Display the current run-level of the init process.

c) Display information about currently logged-in users
The w command displays a summary of the current activity on the system, including what each user is doing. The heading line shows the current time, the length of time the system has been up, the number of users logged into the system, and the average number of jobs in the run queue over the last 1, 5 and 15 minutes.

$ w

d) Find out who is logged in on remote machines

$ rusers remoteserver

See also

• Solaris Run level change

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• 20201124 : who Command in Linux - Linuxize ( who Command in Linux - Linuxize, Nov 24, 2020 )

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[Nov 24, 2020] who Command in Linux - Linuxize

who will output a formatted list of all users that are currently logged on the system.

Each line contains four fields separated by one or more spaces:

• The name of the logged user.
• The user's terminal.
• The time when the user logged in.
• The hostname or IP address from where the user is logged in. To force Ips, use the --ips option.

If you want to print the column headings, add the -H (--heading) option:

who -H

NAME      LINE         TIME             COMMENT
root      pts/0        2020-11-17 20:10 (10.10.0.2)
linuxize  pts/1        2020-11-17 20:11 (10.10.0.8)

The command pulls information about the system and who is logged in from the /var/run/utmp file. If you want to use another file, pass the file path to the command.

who accepts two non-option arguments. When invoked with two arguments the command prints information only about the terminal associated with the current user. The same output is displayed when the -m option is used.

You can use any two arguments:

who am i 

Each of the commands above will print the same information:

linuxize  pts/1        2020-11-17 20:11 (10.10.0.8)

who Command Options

who accepts several options that generally are rarely used.

The -b, --boot option tells who to print the time of last system boot:

who -b

         system boot  2020-07-20 19:02

To get a list of all the dead processes use the -d, --dead option:

who -d

The -r, --runlevel option, tells who to show the current runlevel:

who -r

         run-level 5  2020-07-20 19:02

To get only the user names and the number of currently logged in users, use the -q, --count option:

who -q

root linuxize
# users=2

The -a, --all option forces who to print all information:

who -a

           system boot  2020-07-20 19:02
LOGIN      tty1         2020-07-20 19:02               673 id=tty1
           run-level 5  2020-07-20 19:02
root       - pts/0      2020-11-17 20:10   .       2212314 (89.205.101.54)
           pts/2        2020-10-10 10:19           1363538 id=ts/2  term=0 exit=0
linuxize   + pts/1      2020-11-17 20:11 01:46     2212387 (89.205.101.54)

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