Shell Scripting (BASH)

In the simplest terms, a shell script is a file containing a series of commands. The shell reads this file and carries out the commands as though they have been entered directly on the command line.

• BASH ( Bourne-Again SHell ) – Most common shell in Linux. It’s Open Source.
• CSH (C SHell) – The C shell’s syntax and usage are very similar to the C programming language.
• KSH (Korn SHell) – Created by David Korn at AT & T Bell Labs. The Korn Shell also was the base for the POSIX Shell standard specifications.
• TCSH – It is an enhanced but completely compatible version of the Berkeley UNIX C shell (CSH).

 

Here I am scripting a shutdown command .

# vim shutdown.sh

add

#!/bin/bash
sudo shutdown -h now

:wq

#now type ls you can see the file shutdown.sh
#to run type sh shutdown.sh 


Its similar to DOS batch file .