Re: unshift

[Dennis Eriksen <d@ennis.no>]

Hi,

On Mon, Apr 01, 2024 at 06:52:00AM -0700, Ray Andrews wrote:
>shift
>while [ "$1" ]; do
>    if [ a ]; then b; c; continue fi
>    if [ d ]; then e; f; continue fi
>    if [ g ]; then h; i; continue fi
>...
>shift
>done
>
>... because only one 'if' test will be relevant per loop and the
>remaining 'if' tests might even do some bad stuff.  The problem of
>course is that if I 'continue', the final 'shift' is missed.

Why not just use 'elif'? :)

shift
while [ "$1" ]; do
     if   [ a ]; then b; c;
     elif [ d ]; then e; f;
     elif [ g ]; then h; i;
     fi
     shift
done

If 'a' matches, the rest of the conditional won't run.

You could even use 'case'

shift
while [ "$1" ]; do
     case $1 in
         a) b; c;;
         d) e; f;;
         g) h; i;;
     esac
     shift
done

The execution terminates on ';;'.

-- 
Dennis Eriksen