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Message-ID: <4284A1A2.6060306@byu.net>
Date: Fri, 13 May 2005 06:46:26 -0600
From: Eric Blake <ebb9 AT byu DOT net>
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To: Pekka Niiranen <pekka DOT niiranen AT wlanmail DOT com>
CC: cygwin AT cygwin DOT com
Subject: Re: SOLUTION: Strange behaviour with output redirection (MORE information,   Bug in awk.exe?)
References: <d5flgq$rk8$2 AT sea DOT gmane DOT org> <d5ktvq$194$1 AT sea DOT gmane DOT org> <d5vt1u$9he$1 AT sea DOT gmane DOT org>
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According to Pekka Niiranen on 5/12/2005 9:42 AM:
> Commenting out ANY one of those 7 lines fixed the problem.
> It seems I was running out of some resources
> but cannot explain what is it.
> 
> Is "$((  ))" for arithmetic safer? Anyone?

$(( )) is certainly faster in bash, as it a builtin and avoids forking,
but does not work under ash (/bin/sh).  As long as you are happy with
bash-isms and nonportable code, definitely go for the $(( )) idiom.

For a comparison:
$ strace bash -c 'echo $(( 1 + 1 ))' | grep fork | wc
      0       0       0
$ strace bash -c 'echo `expr 1 + 1`' | grep fork | wc
     41     486    3615

- --
Life is short - so eat dessert first!

Eric Blake             ebb9 AT byu DOT net
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