From: Peter Stephenson <Peter.Stephenson@csr.com>
To: <zsh-users@zsh.org>
Subject: Re: [[ and [
Date: Tue, 6 Mar 2012 11:44:04 +0000 [thread overview]
Message-ID: <20120306114404.359e1c9d@pwslap01u.europe.root.pri> (raw)
In-Reply-To: <20120306113532.789859ca@pwslap01u.europe.root.pri>
On Tue, 6 Mar 2012 11:35:32 +0000
Peter Stephenson <Peter.Stephenson@csr.com> wrote:
> However,
>
> [[ $foo -eq "" ]]
>
> does exactly what it looks like it does
Sigh. Sort of. [ ... -eq ...] and [[ ... -eq ... ]] are numeric tests,
so if foo is a string of zeros it's not doing what it looks like. I
should have said
[ $foo = "" ]]
and
[[ $foo = "" ]]
or
[[ $foo == "" ]]
I don't know why it's that way round, it seems a bit illogical (which is
why Perl is the other way), but it always has been that way.
--
Peter Stephenson <pws@csr.com> Software Engineer
Tel: +44 (0)1223 692070 Cambridge Silicon Radio Limited
Churchill House, Cambridge Business Park, Cowley Road, Cambridge, CB4 0WZ, UK
Member of the CSR plc group of companies. CSR plc registered in England and Wales, registered number 4187346, registered office Churchill House, Cambridge Business Park, Cowley Road, Cambridge, CB4 0WZ, United Kingdom
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next prev parent reply other threads:[~2012-03-06 11:44 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-04 2:36 sergio
2012-03-04 4:24 ` Bart Schaefer
2012-03-06 0:32 ` sergio
2012-03-06 6:05 ` Bart Schaefer
2012-03-06 11:05 ` sergio
2012-03-06 11:35 ` Peter Stephenson
2012-03-06 11:44 ` Peter Stephenson [this message]
2012-03-06 11:53 ` Mikael Magnusson
2012-03-07 9:02 ` Nadav Har'El
2012-03-07 9:05 ` Mikael Magnusson
2012-03-07 9:21 ` Nadav Har'El
2012-03-07 15:27 ` Bart Schaefer
2012-03-07 8:52 ` Nadav Har'El
2012-03-07 9:43 ` Peter Stephenson
2012-03-07 14:11 ` Nadav Har'El
2012-03-07 14:27 ` Peter Stephenson
2012-03-07 18:38 ` Mark
2012-03-06 16:16 ` sergio
2012-03-06 16:29 ` Peter Stephenson
2012-03-06 17:40 ` sergio
2012-03-07 8:12 ` Nadav Har'El
2012-03-04 4:50 ` Kurtis Rader
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