为什么我的 Bash 脚本中会出现此错误：“script.sh：第 8 行：[：参数太多”？

Question

我有这个脚本：

#!/bin/bash

myIp=$(ip add sh | grep inet | grep -v -E 'docker|inet6|127'| awk '{print $2}' | cut -d'/' -f1)

mySubnet=$(echo $myIp | cut -d'.' -f 1,2,3)

subnetBits=$(ip add sh | grep inet | grep -v -E 'docker|inet6|127' | awk '{print $2}' | cut -d'/' -f2)

#Check if not 24 bit

if [ $subnetBits -neq 24 ]; then

    echo "Subnet other than 24 bit detected - quitting now"

    exit 3
fi

for number in {1..254}; do

    if curl -s $mySubnet.$number:80 > /dev/null ; then

        echo "Found somebody listening on port 80 -- $mySubnet.$number"
    fi
done

每次我尝试运行它时，都会出现错误：

script.sh: line 8: [: too many arguments