To get to runlevel 3 in Linux Mint, press the Control-Alt-F2 key combination and login at the virtual terminal, then run this command to shut down the login manager. sudo service mdm stopsudo service mdm stop Then you may use the Linux Mint virtual terminal instead of the desktop if you wish. Just run this …

To add a subscription after installing Red Hat Enterprise Linux 7.2, type this command as root. [[email protected] jason]# subscription-manager register –username USERNAME –password “PASSWORD” This will setup your Red Hat subscription. Then enter this command. This will refresh all of the information on your machine. [[email protected] jason]# subscription-manager refresh And finally, run this command to …

A useful awk implementation to count the number of entries in the /etc/passwd file. [email protected]:~$ sudo awk -F: ‘{ print $1 }’ /etc/passwd | wc -l [email protected]:~$ sudo awk -F: ‘{ print $1 }’ /etc/passwd | wc -l 34 And the quintessential “Hello World” in Awk. [email protected]:~$ awk ‘BEGIN { printf "%s, %s\n", "Hello", "World!" …

The Caps Lock key may be toggled using the command line. The xdotool utility will do this for you. Firstly, install the utility. [email protected] ~ $ sudo apt install [email protected] ~ $ sudo apt install xdotool Then toggle the caps lock key with this command. [email protected] ~ $ xdotool key [email protected] ~ $ xdotool key …

The lsb_release -a command will print the Ubuntu version to the terminal. This is how you find out information about your Ubuntu installation. [email protected]:~$ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 14.04.2 LTS Release: 14.04 Codename: [email protected]:~$ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 14.04.2 …

This simple little script will print an updating clock in the terminal. #!/bin/sh watch -t -n 1 ‘date +%H:%M:%S | figlet’ This version will print a cow that tells you the time. #!/bin/sh watch -t -n 1 ‘date +%H:%M:%S | cowsay’ And finally, this prints the time using blocky characters. #!/bin/sh watch -t -n 1 …

This simple one-liner will print out all of the news headlines from the BBC news website in a simple text format. This is useful if you want to do something with a list like this. Or if you just want a listing to see if there is anything interesting happening. [email protected]:~$ curl -s http://feeds.bbci.co.uk/news/rss.xml | …

The mount command shows information about your mounted partitions on your machine. iMac305:~ admin$ mount /dev/disk0s2 on / (hfs, local, journaled) devfs on /dev (devfs, local, nobrowse) map -hosts on /net (autofs, nosuid, automounted, nobrowse) map auto_home on /home (autofs, automounted, nobrowse) map -fstab on /Network/Servers (autofs, automounted, nobrowse) /dev/disk0s3 on /Volumes/Scratch (hfs, local, journaled)iMac305:~ …

This sed trick will filter out the unwanted characters and leave only the letters ‘A’. [email protected] ~ $ echo "###AAA" | sed ‘s/###//gi’ [email protected] ~ $ echo "###AAA" | sed ‘s/###//gi’ AAA This is how to re-bind the annoying CAPS-Lock key to Esc. This can give that key a new use. xmodmap -e ‘clear Lock’ …

Changing the hostname on a Linux system is very easy indeed. Use this command to set a new hostname. [email protected]:~$ sudo hostname netbook.local Then edit the /etc/hosts file to set the new hostname. [email protected]:~$ sudo vim.tiny /etc/hosts And edit it to the new value. 127.0.0.1 localhost 127.0.1.1 netbook.local # The following lines are desirable for …

The caps lock key on Linux is very annoying when hit accidentally. Especially when you are typing a password. This simple command will disable the key permanently. [email protected] ~ $ setxkbmap -option ctrl:nocaps If you put this in Startup Applications which may be found under System-Preferences-Startup Applications, the caps lock key will be disabled when …