On Thu, Aug 05, 1999 at 10:10:30AM +0200, Andreas Tille wrote:
> On Thu, 5 Aug 1999, Mirek Kwasniak wrote:
>
> > 1) For builtins bash has also help:
> >
> > $ help let | less
> >
> > 2) Usage of man (my pager is `less')
> >
> >
> > 3) Usage of info
> Please don't understand me wrong. I *found* the text where
> the description of let is documented. But what do I have to
> type if I want to increase a shell variable? The syntax of
> "arithmetic expression" remains unclear and an example, how
> to do
>
> a = $b + $c * $d
> and
> a = ($b + $c) * $d
>
> (because this demonstrates also braces in expresions which might
> be misinterpreted by the shell) would be really helpful.
>
>
bash shells can do:
let a=$b+$c*$d
let a=($b+$c)*$d
but if you want to ensure compatibility with Bourne shells like
ash, you should stick to:
a=$(($b+$c*$d))
a=$((($b+$c)*$d))
HTH,
Mike
[Private mail welcome, but no need to CC: me on list replies.]
hehe... the random sig hits again!
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Michael Merten
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