Problem setting up desktop shortcut for a shell script

Hardware Librem 5
7

I copied this right off of your post.

#!/bin/bash

[ ! -e /usr/bin/wlr-randr ] && echo -e "\e[31mError\e[0m: wlr-randr is missing\n==> sudo apt install wlr-randr" && exit 1

list_scale="1.25 2 1.75"
output="DSI-1"

current_scale=$(wlr-randr --output "${output}" | grep 'Scale:' | awk '{ print $2 }')

next_scale=${list_scale%% *}
flg_found=0
for scale in ${list_scale} ; do
    if [ $flg_found -eq 0 ] ; then
        len=${#scale}
        [ "${scale}" == "${current_scale:0:$len}" ] && flg_found=1
        continue
    fi
    next_scale=${scale}
    break;
done