Hide

What's this?

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.


If you have a new feature suggestion or find a bug, please get in touch via http://commandlinefu.uservoice.com/

Get involved!

You can sign-in using OpenID credentials, or register a traditional username and password.

First-time OpenID users will be automatically assigned a username which can be changed after signing in.

Universal configuration monitoring and system of record for IT.
Hide

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:

Hide

News

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!
Hide

Top Tags

Hide

Functions

Hide

Credits

Quickly clean log files (assuming you don't want them anymore)

Terminal - Quickly clean log files (assuming you don't want them anymore)
for file in `find /var/log/ -type f -size +5000k`; do > $file; done
2009-07-03 17:38:21
User: svg
Functions: file
0
Quickly clean log files (assuming you don't want them anymore)

you don't need to echo, just a plain redirect is enough to empty the file

Alternatives

There is 1 alternative - vote for the best!

Terminal - Alternatives
for file in `find /var/log/ -type f -size +5000k`; do echo " " > $file; done
2009-07-03 16:26:36
User: jemmille
Functions: echo file
0

Empties all files in /var/log over 5000k. Useful if /var goes crazy or if you just haven't cleaned up in a while.

Know a better way?

If you can do better, submit your command here.

What others think

The bash for loop works, but you can do it with less typing with a single find command using find's -exec option:

find /var/log -type f -size +5000k -exec cp /dev/null {} \;

this will invoke cp once for each file, copying /dev/null to it. They syntax of -exec just replaces {} with the name of each file found and runs cp. If you were just deleting those files, you could use the -delete option in place of -exec. See the "ACTIONS" section of the find manpage for more.

Comment by bwoodacre 320 weeks and 6 days ago

Why would you need to use this command when logrotate + cron does it for you already?

Comment by djangofan 192 weeks and 4 days ago

Your point of view

You must be signed in to comment.