1 @rem = '--*-Perl-*--                                       
    @echo off
    perl.exe %_batchname %$
    goto endofperl                                             
  5 @rem ';
    
    # Compress mail...
    
    require 'n:/home/nwalsh/lib/cygnus.pl';                    
 10 require 'timelocal.pl';                                    
    use Cwd;   
    
    select (STDERR); $| = 1;
    select (STDOUT); $| = 1;
 15 
    @DIRS = ("/home/nwalsh/Mail");
    while (@DIRS) {
        $dir = shift @DIRS;
        opendir (DIR, $dir);
 20     while ($fname = readdir(DIR)) {
            $file = "$dir/$fname";
            next if ! -d $file;
            next if $fname =~ /^\.\.?$/;
    
 25         print "$file\n";
            push (@DIRS, $file);
            &compress ($file);                                 
        }
    }
 30 
    exit;

	The prologue handles embedding a Perl script in a DOS batch file.
	The goto statement, interpreted by the DOS batch file interpreter, skips over the body of the Perl script.
	The require statement sources in external program fragments.
	The use statement is similar, but has additional utility. It is a Perl5 function. (Note that this callout area specifies both a line and a column.)
	This is a user subroutine call.