一、screen常用功能

(1)会话恢复--最常用--使用运维工具网络断开后也可以恢复会话

(2)会话共享--我在做操作，其他人也可以看见

(3)多窗口

二、screen有什么用处？

假如我们正在运行一个程序，可能要跑几个小时，但是中途断网了，

在连接上去看不到程序的运行状态，这时就可以用screen来创建会话了。

三、screen基础命令

[root@open*** ~]# screen -ls  列出哪些程序在运行screen

[root@open*** ~]# screen -S apache 启动screen，给它加一个名字

[root@open*** ~]# screen -x apache  -x参数可以进入未断开的会话

四、安装screen

(1)[root@open*** ~]# rpm -qa | grep screen  查询本机是否安装screen

screen-4.0.3-18.el6.x86_64

(2)[root@open*** ~]# yum -y install screen  安装screen

(3)创建一个会话：

[root@open*** ~]# screen -S apache

(4)查看创建的会话：

[root@open*** ~]# screen -ls

There is a screen on:

5410.apache (Attached)

1 Socket in /var/run/screen/S-root.

[root@open*** ~]#

（5）测试  执行一个ping任务，然后断开

[root@open*** ~]# ping baidu.com

PING baidu.com (123.125.114.144) 56(84) bytes of data.

64 bytes from 123.125.114.144: icmp_seq=1 ttl=51 time=50.3 ms

64 bytes from 123.125.114.144: icmp_seq=2 ttl=51 time=50.1 ms

64 bytes from 123.125.114.144: icmp_seq=3 ttl=51 time=50.1 ms

64 bytes from 123.125.114.144: icmp_seq=4 ttl=51 time=50.1 ms

64 bytes from 123.125.114.144: icmp_seq=5 ttl=51 time=50.2 ms

64 bytes from 123.125.114.144: icmp_seq=6 ttl=51 time=50.2 ms

(6)恢复会话

[root@open*** ~]# screen -ls  查看会话，名字是apache

There is a screen on:

5410.apache (Detached)

1 Socket in /var/run/screen/S-root.

[root@open*** ~]# screen -r apache 用-r参数恢复会话

64 bytes from 123.125.114.144: icmp_seq=77 ttl=51 time=50.1 ms

64 bytes from 123.125.114.144: icmp_seq=78 ttl=51 time=50.4 ms

64 bytes from 123.125.114.144: icmp_seq=79 ttl=51 time=50.4 ms

64 bytes from 123.125.114.144: icmp_seq=80 ttl=51 time=51.3 ms

64 bytes from 123.125.114.144: icmp_seq=81 ttl=51 time=53.4 ms

64 bytes from 123.125.114.144: icmp_seq=82 ttl=51 time=49.7 ms

64 bytes from 123.125.114.144: icmp_seq=84 ttl=51 time=50.2 ms

64 bytes from 123.125.114.144: icmp_seq=85 ttl=51 time=50.2 ms

64 bytes from 123.125.114.144: icmp_seq=86 ttl=51 time=50.2 ms

64 bytes from 123.125.114.144: icmp_seq=87 ttl=51 time=51.6 ms

64 bytes from 123.125.114.144: icmp_seq=88 ttl=51 time=52.2 ms

（7）[root@open*** ~]# screen -x apache  -x参数可以进入未断开的会话