Linux:shell: awk: multiple separators

'awk' is a very useful shell command (also a program language) in linux (unix). You split one text line by it. For example, for the line

line="aa, b c , d , f "

what you can do in shell command (bash) is

echo $line|awk -F "," '{print $1 $2 $3 $4}' # to get different columns separated by ","

However, if you wanna split one line with multi-separators, then you could do in the way, for example,

$ line="aa, bb_ ccd: ee"
$ echo $line |awk -F ",|_|:" '{print $1$2$3}'

Note here "|" will do logic "OR" of all separators. This is similar 'egrep'. If you want to grep multi key words, then you could do in the same way (which has been addressed in my other blog, just search grep ).

Latex: subfigure: how to get rid of 'counter' of subcaption

The subfigure 's tutorial

If you want to get rid of 'counter' in front of your sub-captions, use to redefine the command: \thesubfigure by:

\renewcommand*{\thesubfigure}{}

(originally one in subfigure.sty is

\renewcommand*{\thesubfigure}{(\alph{subfigure})}

)

Linux:command: du and quota

My disk quota is full on my account at Fermilab (.../home/zhiyil/desktop/...). So I have to clean to get more rooms to store files to SAM. Use the command:

du -s * .[a-zA-Z]* | sort -n

get an idea of which file is the largest one so that you could deal with them.

Linux:command:shell: diff

One of layouts of printout of the command 'diff' is called: --side-by-side or -y which is also useful. Change the column width, just use

-W columns

--width=columns

. An example:

diff --side-by-side -W 130 file1.txt file2.txt

Linux:command: seq

When printing a sequence of numbers, use 'seq'. One of arguments is '-w' or '--equal-width' which will equalize width by padding with leading zeros.

CVS: update

If you want to checkout the newest version of the package, then do

cd
cvs update .

or

cvs update -A FileWhatYouWantToCheckOut
If you want to get an idea of the difference:

cvs diff

statistics:chi-square calculator

A page to calculate chi-square.

http://www.stat.tamu.edu/~west/applets/chisqdemo.html

given freedom.