Frank Terbeck <ft@bewatermyfriend.org>:
> Frank Terbeck <ft@bewatermyfriend.org>:
> > is_installed() {
> >     prog="$1"
> > 
> >     ret=1
> >     oifs="$IFS"
> >     IFS=:
> >     for dir in $PATH; do
> >         [ -x "${dir:-.}/$1" ] && ret=0
> 
> Thinking more about it, this is probably better done like this:
> 
>     
>         [ -x "${dir:-/bin}/$1" ] && ret=0

And another improvement:
        [ -x "${dir:-/bin}/$1" ] && ret=0 && break

For obvious reasons. :-)

Regards, Frank