Note to myself

apt-get -f upgrade
apt-get update
dpkg -i bla bla bla

http://www.thegeekstuff.com/2009/04/vi-vim-editor-search-and-replace-examples/

http://www.tecmint.com/wc-command-examples/

http://www.thegeekstuff.com/2012/10/15-linux-split-and-join-command-examples-to-manage-large-files/

http://www.livefirelabs.com/unix_commands/5-unix-diff-command-examples-of-how-to-compare-two-text-files.htm

http://www.joshstaiger.org/archives/2005/07/bash_profile_vs.html

https://www.cyberciti.biz/tips/howto-keep-file-safe-from-overwriting.html