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- Who is Who
How to list all users who are currently logged into the Linux system?\n
To check information about users who are currently logged into the system, we use the who command in the Linux system.
The who command is used to display the users logged into the system. The who command related to the w command that is used to display information about the users currently on the machine and their processes.
Syntax
The general syntax of the who command is as follows −
who [OPTION]... [ FILE | ARGUMENT1 ARGUMENT2 ]
Brief description of options available in the who command.
| Sr.No. | Option & Description |
|---|---|
| 1 | -a, --all Same as -b -d --login -p -r -t -T -u |
| 2 | -b, --boot Display last rebooted time of system |
| 3 | -d, --dead Display dead processes and details |
| 4 | -H, --heading Display line of column headings |
| 5 | -l, --login Display system login processes |
| 6 | --lookup Attempt to canonicalize hostnames via DNS |
| 7 | -q, --count Display all login names and number of users logged on |
| 8 | -s, --short Display only name of user, line, and time (default) |
| 9 | -t, --time Display last system clock change |
| 10 | -T, -w, --mesg Add user’s message status as +, - or ? |
| 11 | -u, --users Display list users logged in |
| 12 | --message Same as -T |
| 13 | --writable Same as -T |
| 14 | --help Displays a help message and then exits. |
| 15 | --version It gives info about the version and then exits. |
To displays the name of users currently logged in, terminal line numbers, login time of the users in the system, and remote hostname of the user in the Linux system, we use the who command without any options and arguments as shown below.
vikash@tutorialspoint:~$ who vikash :0 2021-01-11 09:40 (:0)
To enhance the output and print information in standard input, we use -H option with the who command as shown in below.
vikash@tutorialspoint:~$ who -H NAME LINE TIME COMMENT vikash :0 2021-01-11 09:40 (:0)
To display the last booted time of the Linux/Unix system using the terminal, we use -b or -- boot option with the who command as shown below.
vikash@tutorialspoint:~$ who –boot System boot 2021-01-11 09:37
Or
vikash@tutorialspoint:~$ who -b System boot 2021-01-11 09:37
To display the current login user in the Linux system, we use the whoami command without any option and arguments as shown below.
vikash@tutorialspoint:~$ whoami vikash
To display more information about the command, we use --help option with the who command as shown in below.
$ who --help
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