Setup a machine in the cloud

Setup box

Long Running Sessions

Using solutions like screen or mosh can help workaround ssh hang-ups which can kill any child processes of an active ssh session.

Screen

  • How do I start screen, during an active ssh session?
    • screen
      • will start a screen session with a random name
      • screen -S SESSIONNAME is good for starting a session with a name
  • How do I list any pre-existing screen sessions?
    • screen -ls
  • How to I re-attach or re-join a previous session?
    • screen -r previous_session_name
  • How do I force detach and then reattach a previous session?
    • screen -d -r previous_session_name
  • How do I rename a pre-existing screen session?
    • screen -S old_session_name -X sessionname new_session_name
  • How to check if I'm in a screen session?
    • echo $STY
      • If you are inside a screen session, the output will be the session name
      • otherwise, the output will be empty
  • How do I find my current screen session's name?
    • echo $STY
  • How do I kill a screen session?
    • screen -X -S <SESSION_ID> quit
  • How do I kill my current screen session?
      screen -X -S `echo -n $STY` quit
    
  • How do I scroll?

    • Inside the screen session you can use: CTRL+A (release), [
      • You can then use the arrows to scroll around the window. To get out of scrolling you can use CTRL+C
    • Ctrl + A, ESC and then vim-like commands: Ctrl + u or Ctrl + d
    • You can modify .screenrc to allow mouse-based scrollback.

        # added on july 19 2017 by pulkit
        # after editing the source from: https://gist.github.com/ChrisWills/1337178
      
        # GNU Screen - main configuration file
        # All other .screenrc files will source this file to inherit settings.
        # Author: Christian Wills - cwills.sys@gmail.com
      
        # Allow bold colors - necessary for some reason
        attrcolor b ".I"
      
        # Tell screen how to set colors. AB = background, AF=foreground
        termcapinfo xterm 'Co#256:AB=\E[48;5;%dm:AF=\E[38;5;%dm'
      
        # Enables use of shift-PgUp and shift-PgDn
        termcapinfo xterm|xterms|xs|rxvt ti@:te@
      
        # Erase background with current bg color
        defbce "on"
      
        # Enable 256 color term
        term xterm-256color
      
        # Cache 999999 lines for scroll back
        defscrollback 999999
      
        hardstatus alwayslastline
      
        # Very nice tabbed colored hardstatus line
        hardstatus string '%{= Kd} %{= Kd}%-w%{= Kr}[%{= KW}%n %t%{= Kr}]%{= Kd}%+w %-= %{KG} %H%{KW}|%{KY}%101`%{KW}|%D %M %d %Y%{= Kc} %C%A%{-}'
      
        # Hide hardstatus: ctrl-a f
        bind f eval "hardstatus ignore"
      
        # Show hardstatus: ctrl-a F
        bind F eval "hardstatus alwayslastline"
      

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