How to Create Your First Bash Scrip touch hello_world.sh Find the path to your bash shell. where bash is located which bash touch hello.sh ls -al Permission of file #! bin bash #! /bin/bash echo "hello" for execute ./hello.sh Comment # before line of comment it give more information about script ++++++++++++++++++++++++++++++++++++++++++++++ when ever we define a Variable it can store somedata string data any no or any other kind of data 1 System variable 2 Userdefine variable System variable echo $BASH echo $BASH_VERSION echo $HOME echo $HASH_VERSION echo $PWD 2. USERDEFINE VARIABLE name = Mark echo $name echo "this is my $name +++++++++++++++++++++++++ #To take the input from user echo "enter name: " read name echo "entered name $name" ++++++++++++++++++ for multiple name echo "enter name: " read name1 name2 echo "Names: entered $name, $name1, $name2" +++++++++++ to print on same line read -p 'usena