Category: Linux

Add a \n after every line in a file using the sed command… sed G

System info about a user. Try: finger root. An admin needs it all the time finger user_name #finger root Login:…

Find the IP address of all the active interfaces. ifconfig | egrep -o ‘^[a-z0-9]{1,12}|inet addr:[0-9.]+’

If you use the diff command, you will be able to see the difference between the files as shown below:…

Find where the command executable is located… whereis perl

Recursively check a folder to find the given text using grep grep -R “text” *

This command takes an input file and substitutes strings inside it with the parameters passed, similar to substituting for variables….

DDClient is a tool that lets you auto update your ip with services like dyndns.org. This is how you install…

This will let you run a linux command based on the success of anther command. Note: This will only work…

Create a command that will return the pid of the given command string.. #!/bin/sh ps aux|grep 1|head -n1|awk ‘{print2}’