How to write a shell script

1. First create a directory

VI hello.sh

2. Write the first line of the shell

#!/bin/bash (in order to declare a shell script, the first line must be written like this)

3. You can add comments

#the First program (this line of add # is not in effect)

4. Writing scripts

echo "Hello World"

5. Execute the script,

give Execute permission: chmod u+x hello.sh or chmod 755 hello.sh

Execute script:./hello.sh

or Direct bash hello.sh

How to write a shell script