30 Useful Linux Commands for System Administrators

In this article we are going to review some of the useful and frequently used Linux or Unix commands for Linux System Administrators that are used in their daily life. This is not a complete but it’s a compact list of commands to refer when needed. Let us start one by one how we can use those commands with examples.

30 Useful Linux System Administration Commands

1. Uptime Command

In Linux uptime command shows since how long your system is running and the number of users are currently logged in and also displays load average for 1,5 and 15 minutes intervals.

# uptime
08:16:26 up 22 min,  1 user,  load average: 0.00, 0.03, 0.22

Check Uptime Version

Uptime command don’t have other options other than uptime and version. It gives information only in hours:mins if it less than 1 day.

[tecmint@tecmint ~]$ uptime -V
procps version 3.2.8

2. W Command

It will displays users currently logged in and their process along-with shows load averages. also shows the login name, tty name, remote host, login time, idle time, JCPU, PCPU, command and processes.

# w
08:27:44 up 34 min,  1 user,  load average: 0.00, 0.00, 0.08
USER     TTY      FROM              LOGIN@   IDLE   JCPU   PCPU WHAT
tecmint  pts/0    192.168.50.1     07:59    0.00s  0.29s  0.09s w

Available options

1. -h : displays no header entries.
2. -s : without JCPU and PCPU.
3. -f : Removes from field.
4. -V : (upper letter) – Shows versions.

3. Users Command

Users command displays currently logged in users. This command don’t have other parameters other than help and version.

# users
tecmint

4. Who Command

who command simply return user name, date, time and host information. who command is similar to w command. Unlike w command who doesn’t print what users are doing. Lets illustrate and see the different between who and w commands.

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