ozooxo

beta@landmark:~$ sudo add-apt-repository ppa:hrzhu/smlnj-backport
beta@landmark:~$ sudo apt-get update
beta@landmark:~$ sudo apt-get install smlnj
beta@landmark:~$ sml
Standard ML of New Jersey v110.75 [built: Tue Aug 20 07:15:06 2013]
- 

ozooxo

beta@landmark:~/Downloads$ sudo apt-get install nodejs
beta@landmark:~/Downloads$ sudo apt-get install npm
beta@landmark:~/Downloads$ npm install highlight.js
beta@landmark:~/Downloads$ node
> var hljs = require('highlight.js');
undefined
> hljs.highlightAuto("<p>abc</p>").language;
'xml'

ozooxo

After trying to repair the touch-pad of my Ubuntu 12.04, the system cannot boot from X Window. It turns out that xserver-xorg is accidentally removed by sudo apt-get autoremove process after I installed xserver-xorg-input-synaptics. To repair it, just go to the recovery mode and

sudo apt-get install xserver-xorg
sudo dpkg-reconfigure xserver-xorg

ozooxo

sudo update-alternatives --config javac 
sudo update-alternatives --config java

ozooxo

matlab -nojvm
matlab -nodesktop

ozooxo

pdftk HW1_word.pdf HW1_photo.pdf cat output HW1.pdf

ozooxo

I accidentally installed multiple versions of MPI's (openmpi, mpich2, ...) in my Ubuntu 12.04 machine. I removed them all, and installed openmpi again; however, after fixing that (I never try before that), my MPI always gives rank=0, size = 1. The reason is that the removal process is incomplete, hence causes file sharing conflict. It can be seen from the following test

beta@landmark:~$ whereis mpicc
mpicc: /usr/bin/mpicc.mpich2 /usr/bin/mpicc.openmpi /usr/bin/mpicc 
/usr/bin/X11/mpicc.mpich2 /usr/bin/X11/mpicc.openmpi /usr/bin/X11/mpicc 
/usr/share/man/man1/mpicc.1.gz

It turns out that the packages libmpich2-3 and libmpich2-dev failed to be removed. So after apt-get remove libmpich2-3 libmpich2-dev, everything goes fine.

ozooxo

My ubuntu just detects all .m files as Objective-C source code (text/x-objcsrc), so I'd like to add matlab mine.types to it. So I sudo gedit /etc/mime.types and add a line text/x-matlab m. If I want to automatically start matlab IDE, I should also add application/matlab m.

However, it seems not working at least in Ubuntu 12.04.

ozooxo

sudo apt-get install libglib2.0-dev
sudo apt-get install libgtk2.0-dev #optional
cat >hello.c <<EOL
#include <glib.h>
int main () { 
    return 0; 
}
EOL
gcc `pkg-config --cflags glib-2.0` hello.c `pkg-config --libs glib-2.0` -o hello

ozooxo

sudo apt-get clean # cleaning up of the apt cache. it gives me roughly 500MB cache
sudo apt-get purge linux-image-3.5.0-37-generic # roughly 100MB per removed kernal. kernal list is in /boot/.