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From: Bart Schaefer <schaefer@brasslantern.com>
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Date: Fri, 14 Jan 2005 16:27:50 +0000
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Subject: Austin Group Interpretation RE: tail -1
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Just as a footnote to the recent GNU coreutils discussion ...

Interpretation Number:  027
Date:  Tue, 24 Aug 2004 10:12:42

The standard permits implementations to have extensions that violate the
Utility Syntax Guidelines so long as when the utility is used in line
with the forms defined by the standard that it follows the Utility Syntax
Guidelines. Thus head -42 file and ls --help are permitted as extensions.

See http://www.opengroup.org/austin/interps/protected/documents.tpl
revised interpretation AI-027.