Re: Use of $@

[Chet Ramey]

On 2/21/23 7:34 AM, 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?

"${!@}" is not a useful expansion. It ends up being indirect expansion,
since it's not defined to do anything else, and "$@" in a context where
word splitting doesn't take place rarely expands to a usable variable name.
It is not equivalent to ${!1} ${!2} ... .

--
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    chet@case.edu    http://tiswww.cwru.edu/~chet/