最近用上了甲骨文的免费VPS，发现Screen无法恢复，提示错误There is no screen to be resumed matching 18804.

解决的办法是加上D，如下：

[opc@wzfou-jp-0917 ~]$ screen -ls
There is a screen on:
        18804.pts-0.wzfou-jp-0917       (Attached)
1 Socket in /var/run/screen/S-opc.
 [opc@wzfou-jp-0917 ~]$ screen -r 18804
There is a screen on:
        18804.pts-0.wzfou-jp-0917       (Attached)
There is no screen to be resumed matching 18804.
[opc@wzfou-jp-0917 ~]$ screen -d 18804
[opc@wzfou-jp-0917 ~]$ screen -r 18804