shell-第五章作业

1. 使用case实现成绩优良差的判断

[[email protected] zuoye]# vim 5.1.sh 
#1/bin/bash
read -p "please input your grade:" grade
case $grade in
        8[5-9]|9[0-9]|100)
        echo "A"
        ;;
        7[0-9]|8[0-4])
        echo "B"
        ;;
        6[0-9])
        echo "C"
        ;;
        *)
        echo "D"
esac            

2. 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

[[email protected] zuoye]# vim 5.2.sh 
#!/bin/bash
a=0
for i in `seq 15`
do
        read -p "please input your name :" name
        if [ "$i -lt 10" ];then
                useradd $name$a$i
                passwd $name$a$i
        else
                useradd $name$i
                passwd $name$i
        fi
done

3. 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

[[email protected] zuoye]# vim 5.3.sh 
#!/bin/bash
read -p "please input your IP: " IP
for i in `seq 120 130`
do
        ping -c2 $IP.$i &>/dev/null
        if [ $? -eq 0 ];then
                echo $IP.$i >> ./host_up.txt
        else
                echo $IP.$i >> ./host_down.txt
        fi
done

4. 使用for实现批量主机root密码的修改
   成功或失败都必须记录
   提示：主机IP存放在一个文件中
   SSH：实现公钥认证，执行远程中主机命令
   实现公钥认证

   ssh-keygen 在用于管理的主上生成密钥对

   ssh-copy-id -i 192.168.2.3

[[email protected] zuoye]# vim 5.4.sh 
#!/bin/bash
for i in `grep ^1 hostip`
do
        echo "you will change the [email protected]$i'passwq "
        ssh $i passwd root
        if [ $? -eq 0 ];then
                echo "[email protected]$i'passwd was change" >> hps
        else
                echo "[email protected]$i'passwq is not change" >> hpf
        fi
done