Re: Use of $@

[Greg Wooledge]

On Tue, Feb 21, 2023 at 01:34:37PM +0100, Christof Warlich wrote:
> $ index() { local e="$1"; shift; for i in "${!@}"; do [[ ${!i} != $e ]]
> || { echo $i; break; }; done; }
> $ LANG=C index "xx yy" "${myarray[@]}"
> bash: a bc xx yy z: invalid variable name
> 
> Can anyone spot what's wrong?

I don't know what "${!@}" does, but clearly it doesn't do what you
thought:

unicorn:~$ set -- a bc; printf '<%s>\n' "${!@}"
bash: a bc: invalid variable name

It looks like it has no use whatsoever, given that it bombs out on
arbitrary inputs.