Blog.Project13.pl

I have a low-memory VPS running online and thus always have to worry about what uses how much memory… Of course top and my favorite htop are very good tools to check this, but sometimes I just want to get a super simple report if I’m overusing memory or not yet. The bellow scripts (most [...]

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){ [...]

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 [...]

With this simple box i’ve learned a little about the “wave” property in blender. This, a little subsurv and smooth subdivision can actually be quite OK for creating a simple ribbon like the one below:The final render looked like this:

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!