making global open-cv module available in a venv

This post is pefect.
http://stackoverflow.com/questions/13312139/opencv-and-python-virtualenv/19213369#19213369

the command 'sl'

do you know about the command sl in unix? I ran into it when I typed it  by mistake instead of  'ls'try it out and try not to get run over by the train :)

'cut' - in place file change: can't do

We cannot run a cut command on a file and change it in place For example:
cut -d',' -f -3 abc.txt>abc.txt

the above command leads to an empty abc.txt file

Perceptually different colors

Sometimes, you need a plot which compares about 10 different methods. In that case there is a particular need for each line in the plots to look different, here is a neat function:(big thanks to harsh agrawal for finding this)

http://www.mathworks.com/matlabcentral/fileexchange/29702-generate-maximally-perceptually-distinct-colors/content//distinguishable_colors.m

sql stuff

-- Key words case insensitive
-- LIKE arguements case insensitive
-- to be continued..

removing symlink to a dir

rm <dir_name>
# no backslash at the end of the directory name