One of the worst ways to find out about vulnerabilities or security holes is when it's too late. The bad guys employ a variety of tools to identify weaknesses to exploit PCs, so it's important to take ...

Let's take a basic example: Let's say I want to make sure that the number of files in my system is always 100. ls -al | wc -l returns 100. I want to drop this into a loop, and if the output of this ...