Random Notes

How to sum values of one column in command line.

cat <file with one column of values> |  paste -sd+ - | bc

How to change vim type to take keyboard input in normal form

Create a file ~/.vimrc if already not exist add below line to it
"set nocp"

What to do if mouse/touchpad stops working on ubuntu suddenly ?

run following commands, it will remove and install the psmouse module of ubuntu
sudo modprobe -r psmouse & sudo modprobe psmouse