Unix Shell Script :How to Use functions

User defined functions can be created in shell scripts. Syntax for creating a function is :

Syntax:

function_name()

{

#code

}

Functions needs to be created before they are called.

Syntax for calling a function in shell script is :

function_name arg1 arg2

Also, command line arguments works similarly they work in shell  scripts. So $1 would be the first argument inside the function , $2 would be the second argument and so on.

Following is an example shell script which contains a fucntion "func()" :

$ cat testfunction.sh

#!/bin/bash

func()

{

echo $1

}

func hello

$ ./testfunction.sh

hello