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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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Universal configuration monitoring and system of record for IT.

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May 19, 2015 - A Look At The New Commandlinefu
I've put together a short writeup on what kind of newness you can expect from the next iteration of clfu. Check it out here.
March 2, 2015 - New Management
I'm Jon, I'll be maintaining and improving clfu. Thanks to David for building such a great resource!

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Psst. Open beta.

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:

  • » The open beta is running a copy of the database that will not carry over to the final version. Don't post anything you don't mind losing.
  • » If you wish to use your user account, you will probably need to reset your password.
Your feedback is appreciated via the form on the beta page. Thanks! -Jon & CLFU Team

Watch contents of a file grow

Terminal - Watch contents of a file grow
tail -n 0 -f /var/log/messages
2009-03-02 14:21:18
User: atoponce
Functions: tail
Watch contents of a file grow

In this case, I'm keeping an eye on /var/log/messages, but of course any file will do. When I'm following a file, I generally don't want to see anything other than what has been added due to the command or service I've executed. This keeps everything clean and tidy for troubleshooting.


There are 5 alternatives - vote for the best!

Terminal - Alternatives

Know a better way?

If you can do better, submit your command here.

What others think

Never thought about that. It's true when you monitor a log file, only new lines are of any interest !

Comment by CodSpirit 425 weeks and 6 days ago

Good idea :)

Comment by raphink 425 weeks and 6 days ago

You can use it without "-n 0".

Just tap enter several times to get some free space between

old and new lines. This might be helpful by watching logfiles

- while - they grow.

Comment by Bender 425 weeks and 6 days ago

I find it useful to associate this with screen splitting in screen. From within a screen session :

^A S : split the screen

tail -n 0 -f /var/log/syslog

^A ^I : focus on the second panel

^A ^C : create a new screen session in the panel

Do your actions in the second panel while you watch your file in the panel on top. Use ^A ^I to switch between panels.

Comment by raphink 425 weeks and 5 days ago

@raphink why not use Yakuake

and you have your log to your right and you can keep executing commands in your left.

Comment by wrongloop 418 weeks ago

Your point of view

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