So you have in mind what is shell scripting ????

Shell scripts or simply scripts are collection or group of command that are stored in a file.Now you will think what’s the use of it ?
Actually it is not possible to run each and every command manually on pc.If this is a repetative job then its again became a headache. So we use Scripting to store those commands and get Outputs. Even we can sheduled the script to run at particular time.

So here we start to write a simple script which will print “Hello World”

Step One
Create a file name firstscript.sh [ remember to give it .sh extension ]
Now open any text editor of your choice and write following commands

Step two : Commands [ Below this Command Begin , Description Given after the script is completed ]

#! /bin/bash
# You Can Comment any thing here
# make sure u use a hash in begningecho “Hello World”# End of Script

Description
First Line should define which shell you are using
there are several shells present in unix system, some of the following are :-
/bin/bash Bash Shell
/bin/sh Bourne Shell
/bin/csh C Shell
/usr/bin/perl Perl Script Shell
/usr/bin/python Python Script Shell

The First Line should start with “#!” Followed by Shell
eg
#! /bin/sh
#! /bin/csh
#! /usr/bin/perl

Then give commands in the file like I’ve supplied “echo” Command in this script
or you can even give direct commands also
like
#! /bin/bash
date
cal
clear

It will give output of date & cal command subsequently and clear screen

You can even provide comment to a command just use a hash “#” in line and it will act as comment

Step 3
Now question arises how to run this script ???
its very simple
there are two methods
Method 1
supply following command
sh firstscript.sh

Method 2
Chmod[chmod command change permission of the file] the file to make it executable file
command is as follows
chmod 777 firstscript.sh

and run script by supplying following thing in your commadn terminal
./firstscript.sh

Stay tuned for more articles on shell scripting