The eval command allows you to run the contents of variables as commands and can be very useful, especially in scripts. There are probably a lot of Linux users who have never encountered the eval ...

In our first tutorial on command line wizardry, we covered simple redirection and the basics of sed, awk, and grep. Today, we're going to introduce the concepts of simple variable substitution and ...

Environment variables are name-value pairs for various programs or processes on an operating system. On Windows, the environment variables store all sorts of information about the operating system ...

Executing programs via the terminal is a quick and efficient way of carrying out operations on your Mac. It offers extended functionality and granular control over the program’s functionality and ...

Lifehacker reader Michael writes in with a nifty tip that was lurking in our comments all along, but deserves to see the bright light of posting. If you're already using the Unix-like Cygwin, it's an ...

Mathematical programming discriminant analysis models must be normalised to prevent the generation of discriminant functions in which the variable coefficients and the constant term are zero. This ...

It is shown that the integer linear programming problem with a fixed number of variables is polynomially solvable. The proof depends on methods from geometry of numbers. Journal Information ...