Re: Bug/limitation in 'time'

[Chris F.A. Johnson]

On Sun, 17 Mar 2013, William Park wrote:

> On Sat, Mar 16, 2013 at 10:15:50PM -0400, Chris F.A. Johnson wrote:
> > On Sun, 17 Mar 2013, Chris Down wrote:
> > >   ExprCount() {
> > >       for (( i = $1 ; i > 0 ; i-- )); do
> > >           :
> > >       done
> > >       echo "$1 iterations"
> > >   }
> >
> >    Or, in a POSIX-compliant manner:
> >
> > ExprCount() {
> >   i=$1
> >   while [ $(( i -= 1 )) -ge 0 ]; do
> >     :
> >   done
> >   echo Just did $1 iterations using expr math
> > }
>
> Are you saying that
>
>    for (( ; ; ))
>
> is not POSIX?

   Right.

   But $(( ... )) is POSIX.

--
   Chris F.A. Johnson, <http://cfajohnson.com/>
   Author:
   Pro Bash Programming: Scripting the GNU/Linux Shell (2009, Apress)
   Shell Scripting Recipes: A Problem-Solution Approach (2005, Apress)