Hopefully by now you understand the need to have a strong password for your computer login. Perhaps you selected your password when you first installed GNU/Linux and you've never changed it. Maybe you don't even know how to change it. Today I'll show you how to change your password from the command line. Read more
Most Linux users are familiar with using the ps and kill commands from the Linux terminal to list and kill processes. Many Windows users are also familiar with ending errant processes by using the Windows Task Manager. But what if Task Manager won't work? Read more
In my job as a mechanical engineer, I work with large text files for finite element analysis models. I sometimes have to run several iterations to evaluate different design proposals and I need to check my models against the baseline to make sure that only the intended changes are included. The tool I use to compare files is diff. Read more
In today's post I'm going to show how to embed a text message into an image file. This type of messaging is known as steganography. Steganography is the practice of hiding secrets in such a way that only the intended message recipient would know to look for your hidden message.
In this basic form of secret messaging we'll be adding text onto the end of a file. I'm going to use the following image of Tux for my example. Read more
Today I'm going to show you how to use the head and tail commands to view portions of text files. There are, of course, other commands that can be used to view text files. The cat command can be useful for viewing small text files while more and less can be good for larger files. But what if you're only interested in just the beginning or the end of a file? That's where head and tail come in. Read more