On 6 June 2013 13:41, Eric Blake wrote:
> > A more robust, (and more portable), formulation may be:
> >
> > echo $var | grep '^+\{0,1\}[0-9]\{1,\}$' > /dev/null 2>&1
>
> Why fork, when straight shell will do?
>
> case $var in
> ...
>
Agreed, avoiding the fork is a good idea, and I do often use case
statements myself, much as you suggest, (although it may be considered
a less obvious solution).
My point was more that the OP's use of grep didn't use a particularly
effective expression for his (perceived) task, and that his use of
grep options wasn't portable.
--
Regards,
Keith.
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