Happy Coding

Testing Javascript with JSFIDDLE

Daniel — Wed, 22 Feb 2012 09:51:21 +0000

Just stumbled over jsfiddle.net a nice tool for testing Javascript on the fly. You can also include the different Javascript frameworks like Jquery, Mootools, YUI etc.

JPPF 3.0 released

Daniel — Tue, 31 Jan 2012 12:24:43 +0000

The new version of the nice Java Parallel Processing Framework (JPPF) is out. See what’s new in the release 3.0 by reading the release notes.

flush memcached via command line

Daniel — Mon, 30 Jan 2012 22:43:11 +0000

Just this simple command will flush the memcached cache:

echo “flush_all” | nc 127.0.0.1 11211

assuming that it runs on the localhost with the default port.

Completely remove MySQL server including all the data from Debian

Daniel — Mon, 19 Dec 2011 10:03:00 +0000

I just tried to uninstall MySQL on Debian via

apt-get remove --purge mysql-server

apt-get remove --purge mysql-client

apt-get autoremove

and wondered that the directories /var/lib/mysql /etc/mysql still existed after the commands. Then I recognized, that a

apt-get remove --purge 'mysql-server.*'

is doing better and removes everything.

Note:

if you get a

/etc/init.d/mysql: WARNING: /etc/mysql/my.cnf cannot be read.

error when you try to re-install MySQL, try a

apt-get purge mysql-common

and try to re-install again.

‘xterm-256color’: unknown terminal type.

Daniel — Thu, 15 Dec 2011 14:41:45 +0000

The following error popped up when I was accessing a Ubuntu EC2 instance from my MacOS X system:

‘xterm-256color’: unknown terminal type.

To fix this error I needed to install ncurses-term via

sudo apt-get install ncurses-term

Netbeans IDE 7.1 Beta

Daniel — Wed, 02 Nov 2011 09:44:59 +0000

Just found out that the new NetBeans IDE 7.1 Beta has integrated GIT support. Nice. And it’s so much nicer to work with Netbeans compared to Eclipse. Especially if you are working with Glassfish.

get text between 2 lines from a file with sed

Daniel — Wed, 21 Sep 2011 16:20:28 +0000

I just had the problem that I wanted to get 2000 lines of text from a big log file (> 20 million lines). It was too much to select it in my Terminal. The only thing I know was where the text of interest started and where it ended. Sed what the hero of this day and helped me with this command:

sed -n '19121287,19123287p' big_log_file.log > sliced_text.log

19121287 was the line number where it starts and 19123287 was the line where it ends.

Developing for Google+

Daniel — Thu, 15 Sep 2011 19:16:02 +0000

Just a quick note: Google+ API released:

The Google+ platform brings that nuance and richness to all of the web. We started with Google’s own products, added the +1 button for site owners and content publishers, and introduced games from a handful of partners. That’s just the beginning though — we want every one of you who builds applications to be able to include rich sharing, identity, and conversations in your app. Today, we’re taking the next step on that journey by launching the first of the Google+ APIs.

Neo4j. NoSQL graph database

Daniel — Sun, 14 Aug 2011 08:43:28 +0000

Neo4j is a graph database, storing data in the nodes and relationships of a graph. The most generic of data structures, a graph elegantly represents any kind of data, preserving the natural structure of the domain.

Kill processes by their name

Daniel — Fri, 24 Jun 2011 08:22:45 +0000

Sometimes you have lots of processes running on your Linux system and you want to kill them all. But you don’t want to spend too much time on killing each process by their process id. A good way to handle with this problem is to combine ps, with grep and awk:

ps -lax | grep "MY SEARCH PATTERN"| awk '{print $3}' | xargs kill -9

In this case I am getting the whole process list, then I search for processes which contain MY SEARCH PATTERN. After this I am getting the 3rd column, because there is the process ID. After that we kill ‘em all!