Re: Ill positioned 'until' keyword

[Andreas Schwab]

Bob Proulx <bob@proulx.com> writes:

> Peng Yu wrote:
>> I looks a little wired why 'until' is the way it is now.
>> ...
>> until test-commands; do consequent-commands; done
>> while ! test-commands; do consequent-commands; done
>
> In the original Bourne shell there is no '!' operator.  The 'until'
> was a way to negate the expression without using a '!' which didn't
> exist in that shell.  An 'if' could operate using the 'else' clause.
> But there wasn't any other way to do it in a while loop.

You could always do

  while test-commands; test $? -ne 0; do ...; done

Andreas.

-- 
Andreas Schwab, schwab@linux-m68k.org
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