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Re: support for POSIX 1003.1-2001 hosts

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: Paul Eggert <eggert(at)twinsun(dot)com>
Cc: chriskl(at)familyhealth(dot)com(dot)au, pgsql-patches(at)postgresql(dot)org
Subject: Re: support for POSIX 1003.1-2001 hosts
Date: 2002-03-12 21:43:29
Message-ID: 200203122143.g2CLhTc08817@candle.pha.pa.us (view raw or flat)
Thread:
Lists: pgsql-patches
Paul Eggert wrote:
> > From: "Christopher Kings-Lynne" <chriskl(at)familyhealth(dot)com(dot)au>
> > Date: Tue, 12 Mar 2002 10:35:35 +0800
> > Importance: Normal
> > 
> > What's wrong with "head -n 1"?
> 
> Nothing's wrong with it from a standards-compliance point of view.
> 
> But I worry that "head -n 1" may not work on some older (pre-POSIX)
> hosts, as it did not work on Unix Version 7 hosts.  In contrast, "sed
> q" did work on those ancient hosts, so I figure "sed q" should be
> safer.  "sed 1q" should be equally good from a portability viewpoint,
> if you prefer.

I have made the 'sed 1q' change you suggested in configure.in, but not
in the docs because I thought it would be too confusing.  The sort
changes, however, were not embraced, as I suspected.  Certainly when we
hit a platform that doesn't understand sort +/-, we will need to make
that change.

-- 
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman(at)candle(dot)pha(dot)pa(dot)us               |  (610) 853-3000
  +  If your life is a hard drive,     |  830 Blythe Avenue
  +  Christ can be your backup.        |  Drexel Hill, Pennsylvania 19026

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