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From: Greg Wooledge <wooledg@eeg.ccf.org>
Newsgroups: gnu.bash.bug
Subject: Re: Strange Problem with 'test' or '['
Date: Wed, 23 Dec 2015 10:20:42 -0500
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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 = /* ]]