是否有可以进入和退出 CLI 的实用程序？

Question

是的，可以使用tmux或，较旧的screen。以下是其各自man页面的摘录：

tmux：

 tmux is a terminal multiplexer: it enables a number of terminals to be
 created, accessed, and controlled from a single screen.  tmux may be
 detached from a screen and continue running in the background, then later
 reattached.

 When tmux is started it creates a new session with a single window and
 displays it on screen.  A status line at the bottom of the screen shows
 information on the current session and is used to enter interactive
 commands.

 A session is a single collection of pseudo terminals under the management
 of tmux.  Each session has one or more windows linked to it.  A window
 occupies the entire screen and may be split into rectangular panes, each
 of which is a separate pseudo terminal (the pty(4) manual page documents
 the technical details of pseudo terminals).  Any number of tmux instances
 may connect to the same session, and any number of windows may be present
 in the same session.  Once all sessions are killed, tmux exits.

 Each session is persistent and will survive accidental disconnection
 (such as ssh(1) connection timeout) or intentional detaching (with the
 'C-b d' key strokes).  tmux may be reattached using:

       $ tmux attach

screen

   Screen  is  a  full-screen  window  manager that multiplexes a physical
   terminal between  several  processes  (typically  interactive  shells).
   Each  virtual  terminal  provides the functions of a DEC VT100 terminal
   and, in addition, several control functions from the ISO 6429 (ECMA 48,
   ANSI X3.64) and ISO 2022 standards (e.g. insert/delete line and support
   for multiple character sets).  There is a scrollback history buffer for
   each virtual terminal and a copy-and-paste mechanism that allows moving
   text regions between windows.

   When screen is called, it creates a single window with a  shell  in  it
   (or  the  specified  command) and then gets out of your way so that you
   can use the program as you normally would.  Then, at any time, you  can
   create new (full-screen) windows with other programs in them (including
   more shells), kill existing windows,  view  a  list  of  windows,  turn
   output  logging  on  and off, copy-and-paste text between windows, view
   the scrollback history, switch between windows in whatever  manner  you
   wish,  etc.  All  windows  run their programs completely independent of
   each other. Programs continue to run when their window is currently not
   visible  and  even  when  the whole screen session is detached from the
   user's terminal.  When a program terminates, screen (per default) kills
   the  window  that  contained it.  If this window was in the foreground,
   the display switches to the previous window; if none are  left,  screen
   exits.

这两个程序都允许您登录服务器、启动进程，然后注销并让其继续运行。当您想要检查时，您可以重新登录服务器并重新连接到正在运行的会话，tmux就像screen您从未离开过一样。您可以从 Ubuntu 存储库安装它们：

sudo apt-get install screen

或者

sudo apt-get install tmux

您可以在我们的姊妹网站上找到有关比较这两个程序的精彩问答，Unix 和 Linux。

Answer 1