1. exit #退出循环，同时也会退出脚本
[root@shell /scripts/shell-day31]# cat exit.sh
#!/bin/bash
for i in {1..3}
do
echo "123"
exit
echo "456"
done
echo "脚本执行结束"
[root@shell /scripts/shell-day31]# sh exit.sh
123
2. break #跳出当前循环，继续执行循环以外的命令
[root@shell /scripts/shell-day31]# cat break.sh
#!/bin/bash
for i in {1..3}
do
echo "123"
break
echo "456"
done
echo "脚本执行结束"
[root@shell /scripts/shell-day31]# sh break.sh
123
脚本执行结束
3. continue #跳出本次循环，不继续执行循环的剩余代码。继续执行下一次的循环。
[root@shell /scripts/shell-day31]# cat continue.sh
#!/bin/bash
for i in {1..3}
do
echo "123"
continue
echo "456"
done
echo "脚本执行结束"
[root@shell /scripts/shell-day31]# sh continue.sh
123
123
123
脚本执行结束
4. 先扫描10.0.0.0/24网段内的主机，存活的主机则下发公钥。
1. 先判断是否存在密钥，没有则进行创建密钥对，有则跳过
2. 批量探测主机是否存活，存活则判断远程端口是否开放
3. 主机存活且端口开放的主机则分发公钥
4. 判断是否发送成功
如何免交互式的进行创建密钥对
-f filename #指定私钥文件保存的路径
-N new_passphrase #指定一个新的密码
ssh-keygen -t rsa -f /root/.ssh/id_rsa -N ""
如何免交互式的分发公钥
-o StrictHostKeyChecking=no #忽略回复yes的交互（避免第一次交互出现 公钥检查）
sshpass -p123456 #指定密码为123456，忽略交互
yum install -y sshpass
sshpass -p1 ssh-copy-id -i /root/.ssh/id_rsa.pub -o "StrictHostKeyChecking=no" [email protected]
[root@shell /scripts/shell-day31]# cat fenfa.sh
#!/bin/bash
#1.引用函数库
[ -f /etc/init.d/functions ] && source /etc/init.d/functions || echo "函数库文件不存在！"
#2.判断是否存在秘钥对
if [ -f /root/.ssh/id_rsa.pub ] && [ -f /root/.ssh/id_rsa ];then
action "密钥对文件存在！" /bin/true
else
rm -rf /root/.ssh &>/dev/null
ssh-keygen -t rsa -f /root/.ssh/id_rsa -N "" &>/dev/null
if [ $? -eq 0 ];then
action "已经创建新的密钥对！" /bin/true
else
action "新的密钥对创建失败！" /bin/false
exit
fi
fi
#3.批量探测主机是否存活
Ip_log=/tmp/ip.log
>$Ip_log
i=1
while [ $i -le 254 ]
do
{
IP=10.0.0.$i
ping -c1 -W1 $IP &>/dev/null
if [ $? -eq 0 ];then
action "${IP}主机是存活的..........." /bin/true
echo "$IP" >>$Ip_log
fi
}&
let i++
sleep 0.1
done
wait
while read line
do
State=$(nmap -p22 $line | awk '/^22/{print $2}')
if [ $State == "open" ];then
action "主机地址${line}远程端口是开放的........" /bin/true
sshpass -p1 ssh-copy-id -p22 -i /root/.ssh/id_rsa.pub -o "StrictHostKeyChecking=no" root@$line &>/dev/null
if [ $? -eq 0 ];then
action "主机地址${line}公钥发送成功........" /bin/true
else
action "主机地址${line}公钥发送失败........" /bin/false
fi
else
action "主机地址${line}远程端口是关闭的........" /bin/false
fi
done < $Ip_log