#!/bin/bash
# Scriptname: do_increment
increment () {
local sum; # sum is known only in this function
let "sum=$1 + 1"
return $sum # Return the value of sum to the script
}
echo -n "The sum is "
increment 5 # Call function increment; pass 5 as a
# parameter; 5 becomes $1 for the increment
# function
echo $? # The return value is stored in $?
echo $sum # The variable "sum" is not known here
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