Re: [Help-bash] append to $@ one by one

[Daniel Mills]

On Sat, Oct 19, 2019 at 9:12 PM Peng Yu <address@hidden> wrote:

> Hi,
>
> I use the following code to read from stdin and set $@ at once. But it
> involves an additional variable "a". Is there a way to avoid such a
> variable by appending to $@ one by one (but it should not be too slow,
> so `set -- "$@" "$x"` will not work.)
>
> while IFS= read -r x; do
>   a+=("$x")
> done
> set -- "${a[@]}"
>
> --
> Regards,
> Peng
>
>
Why not just append all at the same time?

while IFS= read -r x; do
  a+=("$x")
done
# some other logic that sets x and y
set -- "$a[@]}" "$x" "$y"

Alternatively, just append to the array and then do your set. There's no
method to append to the positional parameters, it's either setting them all
at once or not at all.