Re: Strange Problem with 'test' or '['

From	Greg Wooledge <wooledg@eeg.ccf.org>
Newsgroups	gnu.bash.bug
Subject	Re: Strange Problem with 'test' or '['
Date	2015-12-23 10:20 -0500
Message-ID	<mailman.457.1450884050.843.bug-bash@gnu.org> (permalink)
References	<567A76EB.1000506@bytec.de> <20151223140901.GG27325@eeg.ccf.org> <567AB838.5050706@bytec.de>

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On Wed, Dec 23, 2015 at 04:05:28PM +0100, Bytec GmbH - Helmut Koeberle wrote:
> OK, with '[[' ist's working!
> 
> if ([[ "true" = "true" ]] && [[ "${h:0:1}" = "/" ]]); then echo slash; fi

You don't need parentheses around it.  The parentheses force the commands
to run in a subshell (fork()), so it just slows things down.

> if [[ "true" = "true" ]] && [[ "${h:0:1}" = "/" ]]; then echo slash; fi

This is fine, but also note that you can put && inside [[ if you wish:

  [[ "true" = "true" && "${h:0:1}" = "/" ]]

Or you can use pattern matching:

  [[ "true" = "true" && $h = /* ]]

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Re: Strange Problem with 'test' or '[' Greg Wooledge <wooledg@eeg.ccf.org> - 2015-12-23 10:20 -0500

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