一天一命令-screen
screen
多终端窗口管理器，可以通过该软件同时连接多个本地或远程会话，并自由切换
Use: screen [ -options ] [ cmd [ args ] ] screen -r [[pid.]tty[.host]] screen -r sessionowner/[[pid.]tty[.host]] -A 将所有的窗口都调整为目前终端机的大小 -c file 读取指定配置文件 -d 剥离别处正在运行的会话 -D 剥离并退出远程会话 -h 设置回滚的命令历史大小 -l 记录登录状态(记录到/var/run/utmp)，-ln 关闭 -ls 显示所有的会话连接 -L 开启输出日志记录 -m 忽略当前进程变量，建立新的会话 -r [session] 重回剥离的会话 -R 重回剥离的会话，如果找不到则创建新的会话 -s shell 指定建立新会话的shell -S name 创建会话并指定名称 -t title 设置标题 -wipe [match] 清除无法使用的会话 -x 恢复之前的会话
分清终端，会话，窗口的概念
终端：远程开启一个ssh连接，表示开启一个登录终端
会话：开启一个screen会话，如screen -S help表示开启一个会话help
窗口：进入screen会话，可以建立多个窗口，如通过快捷键C-a S可以分割窗口
screen -S help //新建一个会话help screen -ls //列出所有的会话 screen -r num //重新连接指定num或者name的会话，之前的操作依然还在 screen -r help //回到会话help screen -d help //剥离会话help screen -d -r help2 //结束当前会话回到指定会话 exit //退出screen会话，提示信息screen is terminating
screen会话中的快捷键，以下快捷键都是以Ctrl+a开始的，以下均省略，不再说明
Ctrl+a ? 显示所有快捷键
c 创建新的shell窗口并切换，exit关闭或退出
A 重命名当前窗口，输入新名称，然后回车
d 剥离会话，暂时断开当前会话
k 中断当前会话，关闭窗口及窗口中正在运行的进程，同exit
n 切换到下一个窗口
p 切换到上一个窗口
0-9 切换到0-9指定窗口
w 列出当前所有窗口，*号表示当前窗口
如果需要较长时间的操作，可以通过screen命令来避免断网导致命令执行中断：
screen
yes
断开连接，重新连接
screen -ls
screen -r
命令继续执行
exit //命令执行完毕后退出screen窗口
screen远程帮助：
两个终端都通过ssh连接到同一主机
screen -S help //在终端1创建会话help
screen -x help //在终端2加入会话help，可以同时加入多个终端，并且命令都是即时显示的
exit //当有一个终端退出，则screen所有会话都会退出
man screen中的快捷键定义：
The following table shows the default key bindings:
C-a ? (help) 查看快捷键列表
C-a ‘ (select) 输入num或name，直接跳转到指定num或name的会话
C-a " (windowlist -b) 显示所有会话列表，方向键选择，回车进入
C-a 0-9 (select 0-9) 选择指定会话，可以先通过C-a w显示所有会话
C-a tab (focus) 切换到下一个会话
C-a C-a (other) 在当前会话和上一次会话之间跳转
C-a a (meta) Send the command character (C-a) to window. See escape command.
C-a A (title) 设置当前窗口的名称name
C-a b (break) Send a break to window.
C-a B (pow_break) Reopen the terminal line and send a break.
C-a c (screen) 创建一个新窗口并跳转到新窗口
C-a C (clear) 清空当前窗口的内容，类似于clear
C-a d (detach) 剥离当前会话
C-a D D (pow_detach) 剥离并且退出当前终端logout
C-a f (flow) Toggle flow on, off or auto.
C-a F (fit) Resize the window to the current region size.
C-a C-g (vbell) Toggles screen‘s visual bell mode.
C-a h (hardcopy) Write a hardcopy of the current window to the file "hardcopy.n".
C-a H (log) 开始/结束记录当前窗口内容到文件screenlog.n（n表示为num）
C-a i (info) 显示当前窗口的信息
C-a k (kill) 关闭当前窗口
C-a l (redisplay) Fully refresh current window.
C-a L (login) Toggle this windows login slot. Available only if screen is configured to update the utmp database.
C-a m (lastmsg) Repeat the last message displayed in the message line.
C-a M (monitor) Toggles monitoring of the current window.
C-a n (next) 跳转到下一个窗口
C-a N (number) 显示当前窗口的num和名称name
C-a p (prev) 跳转到上一个窗口
C-a q (xon) Send a control-q to the current window.
C-a Q (only) Delete all regions but the current one. See also split, remove,focus.
C-a r (wrap) Toggle the current window‘s line-wrap setting (turn the current window‘s automatic margins on and off).
C-a s (xoff) Send a control-s to the current window.
C-a S (split) 水平分割当前窗口
C-a t (time) 显示系统时间和负载
C-a v (version) Display the version and compilation date.
C-a C-v (digraph) Enter digraph.
C-a w (windows) 显示当前所有开启的窗口，*号表示当前窗口
C-a W (width) Toggle 80/132 columns.
C-a x (lockscreen) 锁定终端，解锁需要密码
C-a X (remove) Kill the current region. See also split, only, focus.
C-a z (suspend) Suspend screen. Your system must support BSD-style job-control.
C-a Z (reset) Reset the virtual terminal to its "power-on" values.
C-a . (dumptermcap) Write out a ".termcap" file.
C-a C-\ (quit) Kill all windows and terminate screen.
C-a : (colon) Enter command line mode.
C-a [或者esc (copy) Enter copy/scrollback mode.
C-a ] (paste .) Write the contents of the paste buffer to the stdin queue of the current window.
C-a {或者} (history) Copy and paste a previous (command) line.
C-a > (writebuf) Write paste buffer to a file.
C-a < (readbuf) Reads the screen-exchange file into the paste buffer.
C-a = (removebuf) Removes the file used by C-a < and C-a >.
C-a , (license) Shows where screen comes from, where it went to and why you can use it.
C-a _ (silence) Start/stop monitoring the current window for inactivity.
C-a | (split -v) Split the current region vertically into two new ones.
C-a * (displays) Show a listing of all currently attached displays.
时间： 2024-08-01 02:16:13