Linux USES function instance details in the Shell script

Linux USES function instance details in Shell scripts

A function of Shell

The Shell program also supports functions. A function that performs a specific function can be called repeatedly.

The function format is as follows:

 The function name ()
{
   The body of the function 
}

Function call method:

Function name argument list

Example: Write 1 function add to find the sum of two Numbers, the two Numbers passed by position parameters, the final output result.

root@ubuntu:/home/study# vi test3 

#!/bin/bash
 
add(){
  a=$1;
  b=$2;
  z=`expr $a + $b`;
  echo "The sum is $z";
}
add $1 $2

 
root@ubuntu:/home/study# chmod +x test3
root@ubuntu:/home/study# ./test3 1 2

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