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#!/bin/sh
eval 'PATH=/usr/local/bin:$PATH \
...
#!perl

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

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

  perl script.pl

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

$ /usr/bin/perl -v

...

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

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

  perl -x script.pl