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  1. or download this
    #!/bin/bash
if [ -x /path/to/perlY ]; then exec /path/to/perlY "$@"
else exec /usr/bin/perlX "$@"
  2. or download this
    #!/usr/bin/perlX

exec '/path/to/perlY', @ARGV if ( -x "/path/to/perlY" );
exec '/usr/bin/perlX', @ARGV;