Commands by wr8cr8 (10)

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


Check These Out

add all files not under version control to repository
This should handle whitespaces well and will not get confused if your filenames have "?" in them

Change pidgin status
Changes pidgin status using its dbus interface. The status code can be obtained using command #4543.

Print just line 4 from a textfile
this method should be the fastest

Create a new file

Batch Convert SVG to PNG (in parallel)
Use GNU Parallel: short, easy to read, and will run one job per core.

which process is accessing the CDROM

Set all CPU cores' CPU frequency scaling governor to maximum performance

Create a backup copy of a MySQL database on the same host
This should probably only be used for testing in a dev environment as it's not terribly efficient, but if you're doing something that might trash a DB and you still want the old data available, this works like a charm.

Check a server is up. If it isn't mail me.
Alternative to the ping check if your firewall blocks ping. Uses curl to get the landing page silently, or fail with an error code. You can probably do this with wget as well.

To convert **.wav to **.mp3 using LAME running one process per CPU core run:


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: