Re: Use of ":" (was: Re: mtab very long)
From: Maurits van Rees (maurits_at_vanrees.org)
Date: 05/25/05
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Date: Wed, 25 May 2005 23:44:48 +0200 To: debian-user@lists.debian.org
On Wed, May 25, 2005 at 08:28:40AM -0400, Paul Smith wrote:
> The most common usage these days is in conjunction with :=, like this:
>
> : ${TMPDIR:=/tmp}
>
> The := form assigns the value if the variable is empty, but it _also_
> substitutes the value. Adding ":" to the front makes that value a
> no-op.
This (and your other example) could be useful, thanks.
-- Maurits van Rees | http://maurits.vanrees.org/ [Dutch/Nederlands] Public GnuPG key: keyserver.net ID 0x1735C5C2 "Let your advance worrying become advance thinking and planning." - Winston Churchill
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