Date: Mon, 25 Sep 2006 11:09:42 -0500 From: Derek Ragona <derek@computinginnovations.com> To: Arindam <arindam.mukerjee@gmail.com>, freebsd-questions@freebsd.org Subject: Re: Korn Shell [[ ... ]] operator Message-ID: <6.0.0.22.2.20060925110339.021a7c68@mail.computinginnovations.com> In-Reply-To: <d85a51ff0609250831x76b9ff15j7c1c2d3e62976802@mail.gmail.co m> References: <d85a51ff0609250831x76b9ff15j7c1c2d3e62976802@mail.gmail.com>
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The [[ ]] operators are for compound tests, the [ ] operator is for simple
tests. In ksh newer than 6/3/86 the [[ ]] makes the [ ] obsolete.
Example of [[ ]]:
[[ foo > bar && $PWD -ef . ]] && print foobar
foobar
That is from the kornshell book co-written by David Korn.
By the way, I use ksh for my root's shell and it works fine.
-Derek
At 10:31 AM 9/25/2006, Arindam wrote:
>I know csh is the shell of choice on FreeBSD. But I have this question
>on Korn Shell and it would be great if somebody could explain.
>
>Can someone tell me a little more about the Korn Shell [[ ... ]]
>double-brackets construct used for comparing string expressions. How
>does it differe from the standard [ ... ] single brackets.
>
>You could tell me to RTFM but I haven't gleaned enough clarity from
>such efforts already expended.
>
>It would be great if you could give some idea through examples.
>
>Cheers,
>Andy
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