编写一个Shell,批量建立用户，设置随机密码

#!/bin/bash
# Author: 电脑程序爱好者
# Date & Time: 2021-04-26 10:03:59
# Description:

for i in test{1..5}; do
    useradd $i
    pass=$(date +%s | md5sum | cut -c 1-8) # 建立随机密码
    sleep 1s
    echo "$i:$pass" >>/tmp/passwd.log
    echo "$pass" | passwd --stdin $i 
    #echo "$i:$pass" | chpasswd # for ubuntu OS
    if [ $? -eq 0 ] ; then
        echo "create user successfully! user:$i,password:$pass"
    else
        echo "failed to create user."
    fi
done