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Re: Some question regarding tail and option "-c"

From: Philipp Thomas
Subject: Re: Some question regarding tail and option "-c"
Date: Mon, 8 Oct 2012 17:40:54 +0200
User-agent: Mutt/1.5.21 (2010-09-15)

* Jim Meyering (address@hidden) [20121003 20:09]:

> I can reproduce that by specifying an older version of POSIX:
>     $ : | _POSIX2_VERSION=0 tail -c 10
>     tail: cannot open '10' for reading: No such file or directory

But AFAICS both 1003.2-1992 and 1003.2-2001 define the syntax as being »-c
number« i.e, with a blank between -c and the number but for 1003.2-1992 tail
only accepts -c<number> .  With POSIX2_VERSION=199209 tail accepts »-n 10«,
so why doesn't -c accept a blank between option and number?


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