commandlinefu.com is the place to record those command-line gems that you return to again and again.
Delete that bloated snippets file you've been using and share your personal repository with the world. 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.
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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.
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Wow, didn't really expect you to read this far down. The latest iteration of the site is in open beta. It's a gentle open beta-- not in prime-time just yet. It's being hosted over at UpGuard (link) and you are more than welcome to give it a shot. Couple things:
At some point you want to know what packets are flowing on your network. Use tcpdump for this. The man page is obtuse, to say the least, so here are some simple commands to get you started.
-n means show IP numbers and don't try to translate them to names.
-l means write a line as soon as it is ready.
-i eth0 means trace the packets flowing through the first ethernet interface.
src or dst w.x.y.z traces only packets going to or from IP address w.x.y.z.
port 80 traces only packets for HTTP.
proto udp traces only packets for UDP protocol.
Once you are happy with each option combine them with 'and' 'or' 'not' to get the effects you want.
There are 2 alternatives - vote for the best!
If you can do better, submit your command here.
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