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From: Charlie Brady <charlieb-supervision@budge.apana.org.au>
Newsgroups: gmane.comp.sysutils.supervision.general
Subject: Re: problems with QMAILQUEUE and reading stdin
Date: Mon, 29 May 2006 09:59:39 -0400 (EDT)
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On Mon, 29 May 2006, B S Srinidhi wrote:

> On Mon, 2006-05-29 at 08:11 -0400, Charlie Brady wrote:
>> Why run cat unnecessarily (and depend on /dev/stdin which only sometimes
>> exists)?
>>
>> Try:
>>
>> tmp=$pq/$(/usr/pkg/bin/safecat "$pq/tmp" "$pq")
>
> hmm... Yeah you are right. :) But is the above thing portable? I mean,
> would this work with shells other than BASH?

It's portable, but not portable to every legacy shell. I understand that 
$() is a POSIX standard. This doc (entitled 'The POSIX standard'):

http://www.cems.uwe.ac.uk/~srking/asa/posix/Notes.pdf

says:

  The backtick construction is deprecated in favour of $(). However the.
  Bourne shell only supports backticks. ...