Package installation

dpkg

Install a package from a .deb file

sudo dpkg -i PACKAGE_NAME

Remove a package

sudo dpkg -r PACKAGE_NAME

Purge a package

This removes the package and all its dependencies

sudo dpkg -P PACKAGE_NAME

List installed packages

dpkg -l

Localhost

Kill a process running on localhost

First, find the process using

lsof -i :3000

Then, kill the process via the PID

kill <PID> 

User management

Create a new user with sudo

Create the new user. Need to use sudo if not signed in as root.

adduser <newuser>

Give sudo priveleges

usermod -aG sudo <newuser>

Useful terminal commands

cmp - Compares to see if two files are equivalent