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Re: Shell script loop runs out of memory

From: Eric Blake <eblake at redhat dot com>
To: cygwin at cygwin dot com
Date: Fri, 01 Jun 2012 07:00:21 -0600
Subject: Re: Shell script loop runs out of memory
Openpgp: url=http://people.redhat.com/eblake/eblake.gpg
References: <loom.20120531T193933-322@post.gmane.org> <CANs8wdBYOBGsmp2iFSSOOd5FZ4qb3i3a-E2EM8LBbPKz=su5Pg@mail.gmail.com> <786EBDA1AC46254B813E200779E7AD36023A42C2@srv1163ex1.flightsafety.com> <loom.20120531T211830-607@post.gmane.org> <0105D5C1E0353146B1B222348B0411A20A770C827D@NIHMLBX02.nih.gov> <CE9C056E12502146A72FD81290379E9A4360C73F@ENFIRHMBX1.datcon.co.uk>

On 06/01/2012 03:20 AM, Adam Dinwoodie wrote:
> Buchbinder, Barry wrote:
>> You might try changing
>>     [[ condition ]]
>> to
>>     [ condition ]
>> Perhaps single brackets use memory differently than double brackets.
> 
> They do: [[ condition ]] is interpreted by the shell; [ condition ] forks to
> call /usr/bin/[.exe.

No, it doesn't.  Bash has a built-in [ rather than forking, since
running tests is so common.

-- 
Eric Blake   eblake@redhat.com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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References:
- RE: Shell script loop runs out of memory
  - From: Adam Dinwoodie

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