linux系统使用screen工具恢复断开的会话

服务器环境是Debian

初次需要下载安装

apt-get install screen

所有参数

Use: screen [-opts] [cmd [args]]
 or: screen -r [host.tty]

Options:
-4            Resolve hostnames only to IPv4 addresses.
-6            Resolve hostnames only to IPv6 addresses.
-a            Force all capabilities into each window's termcap.
-A -[r|R]     Adapt all windows to the new display width & height.
-c file       Read configuration file instead of '.screenrc'.
-d (-r)       Detach the elsewhere running screen (and reattach here).
-dmS name     Start as daemon: Screen session in detached mode.
-D (-r)       Detach and logout remote (and reattach here).
-D -RR        Do whatever is needed to get a screen session.
-e xy         Change command characters.
-f            Flow control on, -fn = off, -fa = auto.
-h lines      Set the size of the scrollback history buffer.
-i            Interrupt output sooner when flow control is on.
-l            Login mode on (update /var/run/utmp), -ln = off.
-ls [match]   or
-list         Do nothing, just list our SockDir [on possible matches].
-L [file]     Turn on output logging. Set logfile name.
-m            ignore $STY variable, do create a new screen session.
-O            Choose optimal output rather than exact vt100 emulation.
-p window     Preselect the named window if it exists.
-q            Quiet startup. Exits with non-zero return code if unsuccessful.
-Q            Commands will send the response to the stdout of the querying process.
-r [session]  Reattach to a detached screen process.
-R            Reattach if possible, otherwise start a new session.
-s shell      Shell to execute rather than $SHELL.
-S sockname   Name this session <pid>.sockname instead of <pid>.<tty>.<host>.
-t title      Set title. (window's name).
-T term       Use term as $TERM for windows, rather than "screen".
-U            Tell screen to use UTF-8 encoding.
-v            Print "Screen version 4.05.00 (GNU) 10-Dec-16".
-wipe [match] Do nothing, just clean up SockDir [on possible matches].
-x            Attach to a not detached screen. (Multi display mode).
-X            Execute <cmd> as a screen command in the specified session.

常用的几个参数

screen -S ***   创建一个***名称的会话
screen -ls   查看当前的所有会话
screen -r ***   恢复一个之前的会话
screen -d *** 　将指定的screen作业离线。
screen   创建一个会话，如果在当前会话中，就是创建子会话（不生成新的pid）
screen -m  强制创建新会话，无论是否已经在screen会话中
若要退出某个screen会话，直接在该会话中exit即可
*** 是自定义的会话名或者pid号

右边的Attached表示依附，也就是会话在连接状态，还有种是Detached，是独立、断开的意思

如果你在当前会话中使用screen又创建了子会话，是无法在子会话中直接进入上次会话的，exit退出当前会话即可回到之前的会话，在子会话中使用-ls参数也可以看到没有生产新的会话

在当前会话中，如果切换wifi导致ssh断开，重新登陆后可以使用screen -x恢复之前的screen会话，或者使用-d参数断开之前的会话名，再使用-r参数恢复那个会话名（也可以合并使用screen -d -r ***参数）