I was loosely involved in a project to reimplement all the Unix commands in Perl back around ~2000 or so.<p>Things seem to live on here:<p><a href="https:&#x2F;&#x2F;metacpan.org&#x2F;pod&#x2F;PerlPowerTools" rel="nofollow">https:&#x2F;&#x2F;metacpan.org&#x2F;pod&#x2F;PerlPowerTools</a>