Linux

GParted - http://gparted.org/download.php

Tomato by Shibby - http://tomato.groov.pl/

Transmission on Tomato firmware - http://geek-mag.com/posts/113462/

vi editor

An introduction to the vi editor

Command Purpose
$ vi <filename> Open or edit a file.
i Switch to Insert mode.
Esc Switch to Command mode.
:w Save and continue editing.
:wq or ZZ Save and quit/exit vi.
:q! Quit vi and do not save changes.
yy Yank (copy a line of text).
p Paste a line of yanked text below the current line.
o Open a new line under the current line.
O Open a new line above the current line.
A Append to the end of the line.
a Append after the cursor's current position.
I Insert text at the beginning of the current line.
b Go to the beginning of the word.
e Go to the end of the word.
x Delete a single character.
dd Delete an entire line.
Xdd Delete X number of lines.
Xyy Yank X number of lines.
G Go to the last line in a file.
XG Go to line X in a file.
gg Go to the first line in a file.
:num Display the current line's line number.
h Move left one character.
j Move down one line.
k Move up one line.
l Move right one character. 
mkusb https://calvin.me/create-persistent-ubuntu-16-04-live-usb-even-boots-ram/

Cron

Cron - https://tecadmin.net/crontab-in-linux-with-20-examples-of-cron-schedule/
Cron - https://crontab.guru

Lien symbolique

$ ln -s /fichier/ou/dossier/deja/existant lien

Custom commands for linux terminal

First interesting file :

$ nano ~/.bashrc
[...]
# Alias definitions.
# You may want to put all your additions into a separate file like
# ~/.bash_aliases, instead of adding them here directly.
# See /usr/share/doc/bash-doc/examples in the bash-doc package.

if [ -f ~/.bash_aliases ]; then
    . ~/.bash_aliases
fi
[...]

Second interesting file :

$ nano ~/.bash_aliases

I put this inside :

alias ls='ls -lha --color=auto'

Then activate alias by typing:

$ source ~/.bash_aliases

Some aliases ideas.

iptables flow

Sources: