more⌗

Compare the following:

$ touch -- -x
$ less -- -x
<control-C>
$ more -- -x
more: unknown option "-x"
usage: more [-dflpcsu] [+linenum | +/pattern] name1 name2 ...

WTF? more doesn’t know what “–” means. Okay, time for a patch.

uniq

$ uniq --help
Usage: uniq [OPTION]... [INPUT [OUTPUT]]

Ah, so we support an INPUT file and an OUTPUT file…that’s not really unix like IMHO. And what you suppose does:

$ uniq *

It’s probably POSIX compliant, but it sucks nonetheless.