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

easily strace all your apache processes

Terminal - easily strace all your apache processes
ps -C apache o pid= | sed 's/^/-p /' | xargs strace
2011-03-15 08:46:33
User: depesz
Functions: ps sed xargs
-1
easily strace all your apache processes

Alternatives

There is 1 alternative - vote for the best!

Terminal - Alternatives
ps auxw | grep sbin/apache | awk '{print"-p " $2}' | xargs strace
2011-03-14 21:45:22
User: px
Functions: awk grep ps xargs
7

This one-liner will use strace to attach to all of the currently running apache processes output and piped from the initial "ps auxw" command into some awk.

ps h --ppid $(cat /var/run/apache2.pid) | awk '{print"-p " $1}' | xargs sudo strace
2012-03-21 01:59:41
Functions: awk cat ps sudo xargs
3

Like the original version except it does not include the parent apache process or the grep process and adds "sudo" so it can be run by user.

ps auxw | grep sbin/apache | awk '{print"-p " $2}' | xargs strace -f
2013-02-19 19:14:57
User: msealand
Functions: awk grep ps strace xargs
1

This version also attaches to new processes forked by the parent apache process. That way you can trace all current and *future* apache processes.

Know a better way?

If you can do better, submit your command here.

Your point of view

You must be signed in to comment.