You need to use who command to display users who are
currently logged in your server
Purpose
Display who is on the system
Syntax
The basic syntax is as follows:
who
who am i
who [options] [File]
who --help
who --version
who | grep 'userNameHere'
who command examples
To show a list of all
the users currently logged in to the system, type:
$ who
root@linuxforfreshers.com:~$ who
root :0 2016-10-03 07:46 (:0)
root pts/61 2016-10-04 08:08 (:0)
root pts/46 2016-10-04 07:58 (:0)
To show only hostname
and user associated with stdin (usually keyboard), enter:
$ who -m
root@linuxforfreshers.com:~$ who -m
root pts/61 2016-10-04 08:08 (:0)
To show active
processes spawned by init:
$ who -p
To show user’s
message status as +, – or ?, enter:
$ who -T
root@linuxforfreshers.com:~$ who -T
root ? :0 2016-10-03 07:46 (:0)
root + pts/61 2016-10-04 08:08 (:0)
root + pts/46 2016-10-04 07:58 (:0)
Show or list users
logged in
Type the command:
$ who -u
root@linuxforfreshers.com:~$ who -u
root :0 2016-10-03 07:46 ?
3431 (:0)
root pts/61 2016-10-04 08:08 .
21700 (:0)
root pts/46 2016-10-04 07:58 01:46 21700 (:0)
Show time of last
system boot
To display time of last system boot pass the -b option to
who command:
$ who -b
root@linuxforfreshers.com:~$ who -b
system
boot 2016-10-03 07:44
Show dead processes
on the system
You need pass the -d option to who command:
$ who -d
OR
$ who -d -H
root@linuxforfreshers.com:~$ who -d
pts/9 2016-10-03 16:56 0 id=/9 term=0 exit=0
pts/58 2016-10-03 16:56 0 id=/58 term=0 exit=0
pts/0 2016-10-03 16:56 0 id=/0 term=0 exit=0
pts/60 2016-10-04 15:55 0 id=/60 term=0 exit=0
pts/62 2016-10-04 15:55 0 id=/62 term=0 exit=0
Show system login
processes
To just display system login processes pass the -l option:
$ who -l
OR
$ who -l -H
root@linuxforfreshers.com:~$ who -l
LOGIN tty4 2016-10-03 07:44 1675 id=4
LOGIN tty5 2016-10-03 07:44 1679 id=5
LOGIN tty2 2016-10-03 07:44 1687 id=2
LOGIN tty3 2016-10-03 07:44 1688 id=3
LOGIN tty6 2016-10-03 07:44 1691 id=6
LOGIN tty1 2016-10-03 07:44 3142 id=1
Count all login names
and number of users logged on the system
To count all login names and number of users logged on:
$ who -q
root@linuxforfreshers.com:~$
who -q
root root root
# users=3
Display the current
runlevel
To display the current system runlevel, type:
$ who -r
root@linuxforfreshers.com:~$ who -r
run-level
2 2016-10-03 07:44
You can combine -r
and -b options as follows:
$ who -r -b
root@linuxforfreshers.com:~$ who -r -b
system
boot 2016-10-03 07:44
run-level
2 2016-10-03 07:44
root@linuxforfreshers.com:~$ who am i
root pts/61 2016-10-04 08:08 (:0)
Displays
"all" information, and headers above each column of data, for
example:
root@linuxforfreshers.com:~$ who -aH
NAME LINE TIME IDLE PID COMMENT EXIT
system
boot 2016-10-03 07:44
run-level
2 2016-10-03 07:44
LOGIN tty4 2016-10-03 07:44 1675 id=4
LOGIN tty5 2016-10-03 07:44 1679 id=5
LOGIN tty2 2016-10-03 07:44 1687 id=2
LOGIN tty3 2016-10-03 07:44 1688 id=3
LOGIN tty6 2016-10-03 07:44 1691 id=6
LOGIN tty1 2016-10-03 07:44 3142 id=1
root ? :0 2016-10-03 07:46 ?
3431 (:0)
pts/9 2016-10-03 16:56 0 id=/9 term=0 exit=0
pts/58 2016-10-03 16:56 0 id=/58 term=0 exit=0
root + pts/61 2016-10-04 08:08 .
21700 (:0)
pts/0 2016-10-03 16:56 0 id=/0 term=0 exit=0
root + pts/46 2016-10-04 07:58 01:39 21700 (:0)
pts/60 2016-10-04 15:55 0 id=/60 term=0 exit=0
pts/62 2016-10-04 15:55 0 id=/62 term=0 exit=0
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