Slackware, solaris, a bsd variant. Or Bell Labs Unix, all around any use does it with those. But if I had to pick...Slackware without the huge unix registry bug.
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"Beware the Jabberwock, my son!
The jaws that bite, the claws that catch!
Beware the Jubjub bird, and shun
The frumious Bandersnatch!"