#!/bin/sh
eval 'PATH=/usr/local/bin:$PATH \
exec perl -x -S $0 "$@"'
  if 0;
#!perl

print "this is $^X, version $]\n";

##</code><code>##

  /path/to/some/other/perl script.pl

##</code><code>##

  perl script.pl

##</code><code>##

$ ./script.pl
this is /usr/local/bin/perl, version 5.012002

##</code><code>##

$ /usr/bin/perl -v

This is perl, v5.8.8 built for x86_64-linux-gnu-thread-multi

$ /usr/bin/perl script.pl
this is /usr/local/bin/perl, version 5.012002

##</code><code>##

>perl script.pl
Can't exec /bin/sh at script.pl line 1.

##</code><code>##

  perl -x script.pl