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Keylogger is a program used to monitor keystrokes. the keystrokes are stored in a file somewhere. Lets say you want to see what other people were doing on your computer, when you were away. you can just start the keylogger and spy on them! A Keylogger can be used by a hacker to record sensitive information like usernames, password or credit card detail etc. NOTE: This piece of code should not be used for unethical means. if you do so you are on your own risk. I have written a very simple keylogger in python using pyxhook  module which is an implementation of  pyhook module (for Windows OS). Let's first see how to run the keylogger and after that we will understand how it is written. Read more »

apt-get is a  package management command line tool. It is used to download, install & remove and update software packages that are on online repositories. On the other hand apt-cache is used to to search and get information about the packages available in the repository. Read more »