Regarding use and require keywords

Shell Programming and Scripting
1

Hi,
what is the difference between use and require keywords in Perl.

What is the significance of these lines \(what it mean, what is the use of this\) 
      \#!/usr/bin/perl -w   // In Perl script....

      \#!/bin/ksh             //In shell script.....

Thanks

Sweta

2

Looks like homework.

See the FAQ's.
Search the forum with the keywords require perl

3

This page explains it all:

http://perldoc.perl.org/functions/use.html