Blog.Project13.pl

There is sometimes the need to kill some JVM, I usually use “killall java” and that works fine as long as that’s in fact what I want – kill ALL. But let’s say i just want to kill Tomcat and not my IDE? The below method works quite well in such an situation:

[ktoso@homunculus ~]$ sudo [...]

I passed all my exams at my first attempt and should have now some time to relax, right? Well something like that, I’m actually doing quite a lot these days. We’re on the roll with MySQL Integra.
Our server “Kopiec” is somewhat online (running CentOS off course) – we’re able to start/stop if thanks to a [...]

…is exactly what I’m currently trying to do. Thus, I’m out of Mediaframe, and got involved in a fascinating and very cool project. Under the lead of Dr Marek Długosz me and 2 of my friends will be tackling the topic of “MySQL Data Storage Engine Comprehension – with focus on Automatics use cases”. It’s [...]

I’m learning Numerical Analysis right now and a friend of mine found some really nice PS files by dr Marian Bubek ( http://www.icsr.agh.edu.pl/~mownit/mownit.html ). I was really happy to see some *.ps but some people from my fellow students started complaining that they’d rather have pdf’s and not ghostscript files (who knows why they’d do..?). [...]

Let’s say you want to read the ps output inside an AWK script, it’s not so simple since system returns an exit code and not the string you want – it’s being sent to stdout, here is a simple trick to read multiple lines from a shell command inside awk:
awk ‘BEGIN{while (“ps aux” | getline){ [...]

I’ve recently bought a new laptop, a 15.6” HP Probook, that replaced my netbook Asus EEE 900 (needed some bigger hardware to work on “on the move”). One problem I encountered was blender not displaying correctly if I’d expand any dropdown menu etc. The fix is very simple yet powerfull, just set the following:
LIBGL_ALWAYS_SOFTWARE=1 blender
This [...]

Yes, my GNU/Linux skills have been certified and now I can call myself a Red Hat Certified Technician as I’ve today passed the RH-202 exam with a 100% score – which leads me to the idea that I should have tried to tackle RHCE and not RHCT – I’ll do ir eventually someday I guess [...]

Vim is a really amazing text editor (though I’d like to learn Emacs too soon… :-)) and it can be easily expanded to be even more useful. One super cool extension I found is: vis – it allows powerful sed-like line modification (you could use sed from inside vim, but that’s not really “handy”). Vis [...]

Another Command Line Fu oneliner I’ve sumbited today:

#show X window events in chosen window

$ xev -id `xwininfo | grep 'Window id' | awk '{print $4}'`

EnterNotify event, serial 13, synthetic NO, window 0×6400053,

    root 0×13c, subw 0×640005b, time 42431610, (367,0), root:(369,63),

    mode NotifyNormal, detail NotifyVirtual, same_screen YES,

    focus NO, state 16

MotionNotify event, serial [...]

A simple yet usefull command-line-fu I made up:

#list all internet active apps

$ netstat -lantp | grep -i establ | awk -F/ '{print $2}' | sort | uniq

firefox

java

pidgin

thunderbird-b

Lookup this command at CommandLineFu
Thanks to HarimaKenji for fixing a little issue with this command.
—update—
CommandLineFu user submited a super short version for this:lsof -P -i -nComandLineFu ownz!