One thing that's always bothered me about Linux, and UNIX before it, is that there isn't a decent command-line calculator available. You know, something where you can type in solve 5+8 or, better, ...

At times, we need to write shell scripts that are interactive and user executing them need to monitor the progress. For such requirements, we can implement a simple progress bar that gives an idea ...

While Linux systems install with thousands of commands, bash also supplies a large number of “built-ins”—commands that are not sitting in the file system as separate files, but are part of bash itself ...