Table of contents
What is Bash scripting
Bash stands for Bourne Again Shell. A Bash Shell Script is a plain text file containing a set of various commands that we usually type in the command line. It is used to automate repetitive tasks on Linux. To automate day-to-day automation tasks, system admins write bash scripts in the Linux system. Bash script has a .sh extension but the extension is not mandatory.
What is Shell
A Shell is a command-line interpreter between the user and kernel or a complete environment specially designed to run commands, shell scripts, and programs.
Advantages of Shell Script
Easy to use
Time-saving
Automated
Can be installed on all Linux system
Portable
Can run multiple commands
Disadvantages of Shell Script
There may be errors in shell scripting that prove to be quite costly.
The programs in shell script are quite slow while executing and a new process is required for every shell command executed.
Different platforms in shell scripting may also have compatibility problems.
First Bash script
Bash script starts with #! referred to as the shebang followed by /bin/bash it tells the path of the interpreter to execute the commands in the script.
echo: echo is a built-in command in Bash, which is used to display the standard output by passing the arguments. It is the most widely used command for printing the lines of text/String to the screen.
To Run bash use
bash script_name.sh
OR
./script_name.sh
Script to print Hello Wrld!
#!/bin/bash
echo "******************"
echo "Hello World!"
echo "******************"
After execution
Single line comment in bash use [#]
After execution
Multiple line comments in bash use [: ' commented text ']
After execution