Linux Commands
sudo - Super User DO
su - change user
chgrp - change Gourp
chown - change Owner
chmod - change permissions

• rwx = 111 in binary = 7
  
• rw- = 110 in binary = 6
  
• r-x = 101 in binary = 5
  
• r– = 100 in binary = 4
  
• w– = 010 in binary = 2
  
• x– = 001 in binary = 1
  

Tar Balls
tar -xzvf filename - unzip
tar -cvf files /location
Other
echo “Some String” | md5sum
apt update - updates linux
sudo passwd root - Enables disabled root account
sudo passwd -l root - Disables root account
passwd - Change password
Emacs Commands

Wireless Setup

Logwatch is a tool that will monitor your server's logs and email the administrator a digest on a daily basis.

$ sudo apt-get update

$ sudo apt-get install logwatch

For Ubuntu systems with apache server:
edit /usr/share/logwatch/dist.conf/logfiles/http.conf
See Here

Where I found it

sudo service minecraft@survival stop
sudo wget -O /opt/minecraft/survival/minecraft_server.jar <link location>
sudo service minecraft@survival start