Turn off or modify Cheese snapshot sound....

 One solution is to modify the file /usr/share/sounds/freedesktop/stereo/camera-shutter.oga

Solution from: http://unix.stackexchange.com/questions/93368/how-can-i-disable-the-shutter-sound-of-gnome-screenshot

For installing nvidia drivers in various Linux distributions

An excellent link: http://www.tecmint.com/install-nvidia-drivers-in-linux/

Setting bash as the default shell

Instructions in : http://www.cyberciti.biz/faq/howto-set-bash-as-your-default-shell/

1. Look for the path to bash with

which bash

2. Type:

sudo chsh -s output-path-from-previous-step username

Otherway to do that is to modify the /etc/passwd file.

Print odd and even lines from a file

sed -n 2~2p filename

will print even-numbered lines from filename

sed -n 1~2p filename

will print odd-numbered lines.

Source: http://unix.stackexchange.com/questions/26723/print-odd-numbered-lines-print-even-numbered-lines

Create a new user

Type:

useradd username

Set a password:
 
passwd username


To create a new user with directory add -m option

Set up bash as default shell

chsh -s /path/to/shell {user-name}

$ which bash (to kwnow the path to bash)

Source: http://www.cyberciti.biz/faq/howto-set-bash-as-your-default-shell/

Delete files from subdirectories

Delete files of a given type:


(example with *.files):


find . -name \*.swp -type f -delete



Delete files by name:

find . -name "file_name.ext" -delete