Having to constantly press “y” when you want to overwrite the files in a directory can be a huge pain.  To get around that just add a slash in front of the copy command.

\cp /home/me/Music/* /home/me/MusicBK/

Secure Your Linux Desktop and SSH Login Using Two Factor Google Authentication.

This is a pretty good Vi cheat sheet
http://sheet.shiar.nl/vi

Using the command below you can create a simple directory tree just by using standard commands:

find . -print | sed -e ‘s;[^/]*/;|____;g;s;____|; |;g’