while ( nc -l 1025 | bash &> : ) ; do : ; done &

Create a Bash command server - You can send it scripts or commands to execute

Allow to launch nc like a daemon, in background until you still stop it. (like this command: http://www.commandlinefu.com/commands/view/9978 ) For send script or commands from the client to the server, use nc too, like that : cat script.sh | nc server 1025 echo "service openvpn restart" | nc server 1025 The loop's inside doesn't do anything, but we can add echo -e "\nCommand received\n" .
Sample Output
$$ (commande PID)

-8
By: Zulu
2012-01-08 03:31:58

These Might Interest You

What Others Think

Beware, this is a major security risk. Anyone can connect and run arbitrary commands on the server.
Fudo · 332 weeks and 4 days ago
Yep, I completely agree with Fudo - there's more risk than benefit with something like this. You can easily use ssh to remotely execute commands. And with public key authentication, it can still be done without entering a password each time. By running this command, you're in essence turning any local privilege escalation vulnerability into a remote privilege escalation vulnerability. Not good.
NathanielMaier · 332 weeks and 4 days ago
What do you think about : while ( nc -l 1025 | grep -h "^echo" | bash &> : ) ; do : ; done & It's the same thing but it will only let pass echo command.
Zulu · 331 weeks and 5 days ago

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: