USB token authentication on Linux

This article describes a method how to use a USB memory device as an authentication token to log in into a Linux system instead of traditional password. This can be accomplished by use of Pluggable Authentication Modules ( PAM ) and some sort of USB storage device such as USB memory stick of Mobile phone with SD card attached.

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How to crash Linux

There are a number of dangerous commands that can be executed to crash a Linux system. You may find a nefarious user executing these commands on a system you manage, or someone may send you a seemingly harmless command, hoping that you will run it and crash your computer.

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Introduction to Wake On Lan

Wake-on-lan (also known with the “W.O.L” acronym) is a standard ethernet feature which allows a machine to be woken up on the reception of a specific type of network packet (the so called MagicPacket). The main advantage of this feature is that it allows us to keep a machine in a low power consumption state, and be accessed only when needed.

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