Re: unshift

[Dennis Eriksen <d@xxxxxxxx>]

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