Kill a broken ssh connection

<Return>~.
This is useful for example if you are on ssh in a server and the server goes down without letting you out. This is part of a larget sets of escape sequences provided by ssh. You can find them with ~? Here's the list: ~. - terminate connection (and any multiplexed sessions) ~B - send a BREAK to the remote system ~C - open a command line ~R - request rekey ~V/v - decrease/increase verbosity (LogLevel) ~^Z - suspend ssh ~# - list forwarded connections ~& - background ssh (when waiting for connections to terminate) ~? - this message ~~ - send the escape character by typing it twice (Note that escapes are only recognized immediately after newline.)
Sample Output
~$ Connection to dio.ecarlesso.org closed.

11
By: carlesso
2013-06-26 13:34:58

These Might Interest You

  • This command is suitable to use as application launching command for a desktop shortcut. It checks if the application is already running by pgrepping its process ID, and offer user to kill the old process before starting a new one. It is useful for a few x11 application that, if re-run, is more likely a mistake. In my example, x2vnc is an x11 app that does not quit when its connection is broken, and would not work well when a second process establish a second connection after the first broken one. The LC_ALL=C for xmesseng is necessary for OpenSUSE systems to avoid a bug. If you don't find needing it, remove the "env LC_ALL=C" part


    0
    sh -c 'if pgrep x2vnc && env LC_ALL=C xmessage -button "Kill it:0,Ignore it:1" "Another connection is already running. Should I kill it instead of ignoring it?"; then killall x2vnc; fi; x2vnc -passwd /home/Ariel/.vnc/passwd -east emerson:0'
    zhangweiwu · 2010-07-06 09:11:12 0
  • Allow to launch nc like a daemon, in background until you still stop it. You can stop it with kill %1 (jobs method) or kill PID. The -k option can force nc to listen another connection, but if you use redirection, it will work only one time. The loop's inside doesn't do anything, but we can imagine to send a message to screen when a connection is established Show Sample Output


    11
    while ( nc -l 80 < /file.htm > : ) ; do : ; done &
    Zulu · 2012-01-02 02:17:25 4
  • Get out of jail for VMs that won't reboot. Warning: I have no idea why this works or what the implications of the 'destroy_domain' command are but this is how I'm recovering my hung VMs: xe vm-list Locate the UUID of broken VM by name. list_domains Locate ID of broken VM by UUID. destroy_domain -domid <ID> Destroy the domain. xe vm-reboot uuid=<UUID> --force Force a reboot of the VM.


    0
    /opt/xensource/debug/destroy_domain -domid <id>
    rik · 2012-02-23 11:21:49 0
  • Rebuild flv files that are broken (can't seek). This method probably works for other video/audio formats that can become broken in the same way.


    4
    ffmpeg -i broken.flv -acodec copy -vcodec copy fixed.flv
    recursiverse · 2010-05-08 20:31:37 0

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

You must be signed in to comment.

What's this?

commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

Share Your Commands



Stay in the loop…

Follow the Tweets.

Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.

» http://twitter.com/commandlinefu
» http://twitter.com/commandlinefu3
» http://twitter.com/commandlinefu10

Subscribe to the feeds.

Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):

Subscribe to the feed for: