Rotate only one screen

check devices

xrandr -q

and rotate accordingly

xrandr --output LVDS-0 --rotate left

vim screen and the nasty ABCD key-bindings for the arrow keys

This is the solution

set term=xterm

Adding this line to yout .vimrc file or 

:set term=xterm

once you are in vim.





How to add supplementary figures to latex documents

% Reset the figure counter; add 'S' as a prefix for figures; avoid @ being a letter
%%%%%%%%%%%%%%%%%%%%%%%
\setcounter{figure}{0}
\makeatletter
\renewcommand{\thefigure}{S\@arabic\c@figure}
\makeatother
%%%%%%%%%%%%%%%%%%%%%%%

from stackoverflow

How to grep a variable in bash?

export var='chr1'
grep -P ^$var'\t' file.to.grep

This will grep the lines that begin with chr1 followed by a tab. This ignores cases as chr11 or chr19