Re: Use of $@

[Greg Wooledge]

On Tue, Feb 21, 2023 at 11:27:36AM +0100, Christof Warlich wrote:
> just to improve my bash skills: The following functions prints the array
> index of a value if found:
[...]
> Thus, with e.g.: myarray=("a" "bc" "my value" "z")
> $ index "my value" "${myarray[@]}"
> 2
[...]
> The only thing that bothers me is that I couldn't get away
> without the intermediate assignment of $@ to a new array (a): Is there
> really no way to avoid that, i.e. directly using $@ in the for-loop?

unicorn:~$ cat foo
#!/bin/bash

index() {
    local i needle="$1"
    shift
    for ((i=1; i <= $#; i++)); do
        if [[ ${!i} = "$needle" ]]; then
            echo "$((i-1))"
            return 0
        fi
    done
    return 1
}

index zebra horse horse horse zebra horse || echo "not found"
index zebra horse zebra || echo "not found"
index zebra horse horse || echo "not found"

unicorn:~$ ./foo
3
1
not found