1.for创建20用户用户前缀由用户输入用户初始密码由用户输入
例如：test01,test10
 

[root@cotenos day06]# vim useradd.sh

#!/bin/bash
read -p "请输入用户前缀：" user
read -p "请输入初始密码：" pass
for ((i=1;i<=20;i++ ))
do
        if [ $i -lt 10 ];then
                users=${user}0$i
        else
                users=${user}$i
        fi

        if ! id -u $users &> /dev/null
        then
            useradd $users
            echo "$pass" | passwd --stdin $users &> /dev/null
        else
                echo "$users is exists..."
        fi
done

执行：
[root@cotenos day06]# chmod +x useradd.sh 

[root@cotenos day06]# ./useradd.sh

 

2、for ping测试指网段的主机网段由用户输入，例如用户输入192.168.2 ，则ping 192.168.2.10 ---192.168.2.20

UP： /tmp/host_up.txt
Down: /tmp/host_down.txt
 

创建脚本
[root@cotenos day06]# vim ping_ceshi.sh
 

#!/bin/bash
read -p "请输入网段: " ip
for ((i=120;i<=130;i++))
do
        IP="$ip"."$i"
        echo $IP
        if ping -c 2 $IP &> /dev/null
        then
                echo "$IP is up" >>/tmp/host_up.txt
        else

            echo "$IP is down" >>/tmp/host_down.txt                                                  

        fi

done

执行结果

[root@cotenos day06]# bash ping_ceshi.sh 
请输入网段: 192.168.112
192.168.112.120
192.168.112.121
192.168.112.122
192.168.112.123
^C192.168.112.124
192.168.112.125