循环语句与函数

1、创建列表用户并设定初始密码123456

#!/bin/bash ulist=$(cat /root/users.txt) for uname in $ulist do if [ $uname==`grep $uname /etc/passwd | awk -F: '{print $1}'` ] then echo "姓名重复" fi useradd $uname echo 123456 | passwd --stdin $uname &> /dev/null done

2、删除列表用户，并备份用户的文件

#!/bin/bash ulist=$(cat /root/users.txt) for uname in $ulist do a=`ls -lh /home/$uname | awk -F: '{print $2}'` if [ "$a" != "0" ] then cp -r /home/$uname /root/baseup.txt fi userdel -r $uname &> /dev/null done

3、测试ip的连通性

#!/bin/bash hlist=$(cat /root/ip.txt) for ip in $hlist do ping -c 3 -i 0.2 -W 3 $ip &> /dev/null if [ $? -eq 0 ] then echo "Host $ip is up" else echo "Host $ip is down" fi done

4、根据给定的列表用户，给用户的加班工资加100元

#!/bin/bash list=$(cat /root/users.txt) base_money=3000 for uname in $list do money=$(expr $base_money + 100) echo "$uname的工资为：$money" done

5、根据给定的列表用户，给用户的加班工资加100元（位置变量）

#!/bin/bash base_money=3000 for uname in $1 do money=$(expr $base_money + 100 \* $2) echo "$uname的工资为：$money" done

6、添加20个用户，名字依次为stu1，stu2……stu20

#!/bin/bash i=1 while [ $i -le 20 ] do uname="stu$i" if [ `grep $uname /etc/passwd | awk -F: '{print $1}'` ] then echo "名字重复" fi useradd $uname echo 123456 | passwd --stdin $uname $> /dev/null let i++ done

7、批量删除

#!/bin/bash i=1 while [ $i -le 20 ] do uname="stu$i" a=`ls -lh /home/$uname | awk -F: '{print $2}'` if [ "$a" = "0" ] then cp -r /home/$uname /root/baskup.txt fi userdel -r $uname let i++ done

8、猜价格

#!/bin/bash price=$(expr $RANDOM % 1000) times=0 echo "商品实际价格是0~999，猜猜价格是多少？" while true do read -p "请输入你猜测的价格：" INT if [ $INT -eq $price ] then echo "恭喜你猜对了，实际价格是$price，总共猜了$times 次" elif [ $INT -lt $price ] then echo "太低了" else echo "太高了" fi let times++ done

9、计算1~50的和

#!/bin/bash i=0;s=0 until [ $i -eq 50 ] do let "i=$i+1";let "s=$i+$s" done echo "1~50的和是$s"