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From: Bart Schaefer <schaefer@brasslantern.com>
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Date: Wed, 16 Jul 2014 08:51:46 -0700
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Comments: In reply to Sepp Tannhuber <sepp.tannhuber@yahoo.de>
 "Check write permissions" (Jul 16,  2:26pm)
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To: "zsh-users@zsh.org" <zsh-users@zsh.org>
Subject: Re: Check write permissions
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On Jul 16,  2:26pm, Sepp Tannhuber wrote:
}
}  my_variable="${$([[ -w $PWD ]] || echo 0):+my_value}"

Perhaps:

  [[ -w $PWD ]] && my_variable='' || my_variable="my_value"