After watching Mr. Robot S03E01 I looked for the command shred I didn't know. It turns out that it is a great tool.
I was wandering why using it (rm usually removes only the entry in the file table on the disk). I searched for a short article after I figured it out. Some must exists after all :)
Here it is. If someone ask me why is shred useful, I can redirect to this link.

Notes : this is not always the way to erase data (cf: Is it really working?). Turn to shredlog.

rkhunter ist a tool used for malware detection.
sudo apt-get install rkhunter is sufficient to install it.
I don't know if the program is outdated.

Saved for futures shares

A VPN for ssh only (dns included and need python)

Le service web de la commande tldr.  Lien du repository