Basic shell scripting tutorial for Beginners - Linux/Unix
Basic shell scripting tutorial for Beginners - Linux/Unix
In this article, we will learn basic shell scripting for beginners. It is described in very simple language.
What is BASH?
Bash is a command language interpreter. It is widely available on various operating systems and is a default command interpreter on most GNU/Linux systems. BASH stand for ‘Bourne-Again SHell’.
Basic Commands with Example:-
#! /bin/bash
#To view of the command
echo "Hello world"
Output:
>Hello world
#To view of System variable command
echo $PWD
echo $HOME
echo $BASH
Output:
>/c/Users/username/Desktop/RDS/Shell
/c/Users/username /bin/bash
#To view user variable command
name=ram
echo "My name is $name"
#To view of System variable command
echo $PWD
echo $HOME
echo $BASH
Output:
>/c/Users/username/Desktop/RDS/Shell
/c/Users/username /bin/bash
#To view user variable command
name=ram
echo "My name is $name"
Output:
>My name is ram
>My name is ram
name=rakesh
echo "my brother name is $name"
Output:
>my brother name is rakesh
value=100$
echo "ram value is $value"
echo "my brother name is $name"
Output:
>my brother name is rakesh
value=100$
echo "ram value is $value"
Output:
>ram value is 100$
#To use read command to type any name/value and get output with name/value
echo "Enter name : "
read name
echo "Entered name is $name"
Output:
Output:
echo "What is your occupation : "
read work
echo "My occupation is $work"
Output:
>My occupation is work
#To use read command after enter in same line
read -p "username : " user_var
echo "username is : $user_var"
read work
echo "My occupation is $work"
Output:
>My occupation is work
#To use read command after enter in same line
read -p "username : " user_var
echo "username is : $user_var"
Output:
>username is rajesh
#To use read command after entering in same line and password is hidden
read -sp "password : " pass_var
echo "password is : $pass_var"
Output:
>password is 1234
read -p "what is your name: " user_var
read -sp "what is your password: " password_var
echo
echo "My name is $user_var"
echo "My password is $password_var"
Output:
>My name is rajesh
My password is 12344
#To pass argument with multiple variable name such as ./shell.sh ram nam tam
echo $0 $1 $2 $3
>username is rajesh
#To use read command after entering in same line and password is hidden
read -sp "password : " pass_var
echo "password is : $pass_var"
Output:
>password is 1234
read -p "what is your name: " user_var
read -sp "what is your password: " password_var
echo
echo "My name is $user_var"
echo "My password is $password_var"
Output:
>My name is rajesh
My password is 12344
#To pass argument with multiple variable name such as ./shell.sh ram nam tam
echo $0 $1 $2 $3
Run script on terminal:
>./shell ram nam tam
Output:
>./shell ram nam tam
#Please see screenshot for the basic argument which is used in bash script
echo ${args[0]} ${args[1]} ${args[2]}
echo $@
echo $#
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