if you're passing user input to the shell
if youre passing data from untrusted sources unlaundered into the shell (see perlsec) is both more general and to the point. If I'm the user - whom I mostly trust - there's nothing wrong with my data. Except if there is, of course.
</nitpick>
perl -le'print map{pack c,($-++?1:13)+ord}split//,ESEL'
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