实现免密登陆脚本, expect登陆远程主机，将生成的密钥写入到目标主机, expect测试远程登陆

#!/bin/bash
RED="echo -e \E[1;31m"
GREEN="echo -e \E[1;32m"
END="\E[0m"


os_release(){
if grep -i -q ubuntu /etc/os-release;then
            echo ubuntu
        elif grep -i -q centos /etc/os-release;then
            echo centos
        else
            echo "os can not be supported!"
        fi
}

install_mysql(){
if [ `os_type` = centos ] ;then
        yum install mysql -y
elif [ `os_type` = ubuntu ] ;then
        apt install mysql -y
else
        echo "os can not be supported"
fi
${GREEN}安装成功$END
}


install_httpd(){
if [ `os_type` = centos ] ;then
        yum install httpd -y
elif [ `os_type` = ubuntu ] ;then
        apt install apache2 -y
else
        echo "os can not be supported"
fi


${GREEN}安装成功$END
}



ssh_expect(){
    NET=10.0.0
    user=root
    password=qq123456
    IPLIST="
    137
    101
    238
    "
    for ID in $IPLIST ;do
        ip=$NET.$ID

    expect <<eof
spawn ssh $user@$ip
expect {
    "yes/no" { send "yes\n";exp_continue }
    "password" {send "$password\n" }
        "#" { send "exit\n" }   
}
eof
done
}


PS3="请选择功能(1-4): "
select menu in 安装mysql 安装apache 免密钥登录主机 退出;do
       case $REPLY in
       1)
       install_mysql
       ;;
       2)
           install_httpd
              ;;
       3)
           ssh_expect
       ;;
       4)  
             break
        ;;       
       *)
       echo "输出错误"
 esac
done