What is Bash scripting and how does it work?

• Bash, short for Bourne-Again Shell, is a Unix shell and a command language interpreter. It interprets a shell scripting language and executes the commands.

• Bash scripting can be used to automate linux tasks ( automate means instead of executing individual commands to perform a specific task , simply run the bash file which can automate the same process ).

How to create a bash file?

• to create a bash file , type the command given below ->

nano filename.sh

• bash script to perform auto update of installed linux packages.

#! /bin/bash

echo "Do you want to upgrade"  //asking user choice
echo "1. yes"
echo "2. no"
read n
if(($n==1))
then
sudo apt-get upgrade -y  // command to update
elif(($n==2))
then
exit
else
echo "Wrong choice entered"
fi

How to run a bash file ?

• In order to run a bash file , firstly add executable permissions to bash file. To make a bash file executable follow the command given below

chmod +x filename.sh

• After adding executable permissions , run the bash file follow the below command

./filename.sh

Bash Script to install and configure git

• Bash Script to automate the process of installation of git and configure it.

#!/bin/bash

if ! [ -x "$(command -v git)" ];then
echo "Git not found in your system"
echo "--------------------"
echo "--------------------"
echo '###Installing Git..'
sudo apt-get install git -y
echo "---------------------"
echo '###Congigure Git..'

echo "Enter the  Username for Git:";
read GITUSER;
git config --global user.name "${GITUSER}"

echo "Enter the Email for Git:";
read GITEMAIL;
git config --global user.email "${GITEMAIL}"

echo "-------------------------------------"
echo "-------------------------------------"
echo 'Git has been configured!'
git config --list

else
echo "Git is already installed in your system"
fi