Re: "${assoc[@]@k}" doesn't get expanded to separate words within compound assignment syntax

[Greg Wooledge]

On Sun, Mar 24, 2024 at 07:46:46PM +0200, Oğuz wrote:
> On Sunday, March 24, 2024, Zachary Santer <zsanter@gmail.com> wrote:
> >
> > Yeah, but what can you do with @k?
> 
> 
> It helps when reconstructing an associative array as a JSON object in JQ
> 
>     $ declare -A a=([x]=1 [y]=2)
>     $ jq --args -n '[$ARGS.positional | _nwise(2) | {(.[0]): .[1]}] | add'
> "${a[@]@k}"
>     {
>       "y": "2",
>       "x": "1"
>     }

Conceptually that looks great, but how do you avoid "Argument list
too long" with larger inputs?

I've got this example on hand, but it doesn't include a hash:

hobbit:~$ a=("an array" "of strings"); b="a string"; printf '%s\0' "${a[@]}" | 
jq -R --arg b "$b" '{list: split("\u0000"), string: $b}'
{
  "list": [
    "an array",
    "of strings"
  ],
  "string": "a string"
}