function

Linux Shell Scripting – Functions

by

How do I create a shell script function using Bash under UNIX / Linux operating systems?

Functions are nothing but small subroutines or subscripts within a Bash shell script. You need to use to break up a complex script into separate tasks. This improves overall script readability and ease of use. However, shell function cannot return value. They return a status code.

All functions must be declared before they can be used.

function welcome(){
  Commands
}

OR

 
welcome(){
 Commands
 return $TRUE
}

You can call function by typing its name:

 
welcome

Read more