screen 命令

 Screen是一款由GNU计划开发的用于命令行终端切换的自由软件。用户可以通过该软件同时连接多个本地或远程的命令行会话，并在其间自由切换。

   Use: screen [-opts] [cmd [args]]

   or: screen -r [host.tty]

   Options:      -4 Use IPv4.      -6 Use IPv6.      -a Force all capabilities into each window‘s termcap.      -A 将所有的视窗都调整为目前终端机的大小。      -c 用指定的filename文件替代screen的配置文件".screenrc"。      -d (-r) 将指定的screen作业离线。      -dmS name Start as daemon: Screen session in detached mode.      -D (-r) 与-d命令实现一样的功能，区别是执行成功，会踢掉原来在screen里的用户并让它logout。      -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.      -list or -ls 显示目前所有的screen作业。      -L Turn on output logging.      -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.      -r <name> 恢复离线的screen作业。      -R 先试图恢复离线的作业。若找不到离线的作业，即建立新的screen作业。      -s shell 指定建立新视窗时，所要执行的shell。      -S <name> 指定screen作业的名称。      -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 4.00.03 (FAU) 23-Oct-06".      -wipe Do nothing, just clean up SockDir.      -x 恢复之前离线的screen作业。      -X Execute <cmd> as a screen command in the specified session.