Bash脚本错误错误地使用了for循环[

Question

我不明白我在做什么错。任何帮助将不胜感激。

谢谢！

#!/bin/bash
SEATS=$1
seats_remaining=$SEATS
for ((i = $SEATS; i >=1; i--));
do
    echo "$i will take a seat"
    seats_remaining="$(($seats_remaining-1))"
    ./Lab4 $seats_remaining $i &
done
trap "exit" INT TERM ERR
trap "kill 0" EXIT`enter code here`
wait