Who's using up all the bandwidth, and what are they doing? Use iftop to find out.

As a buddy of mine always says "the nice thing about standards is that there's so many to choose from". Take CSV files for example. CSV, of course, stands for "Comma Separated Values", more often than not though, it seems that CSV files use tabs to separate values rather than commas.

If you use the shell you surely know about redirection: # echo 'hello world' >output # cat <output The first line writes "hello world" to the file "output", the second reads it back and writes it to standard output (normally the terminal).

Hone your OpenStack skills with a full deployment in a single virtual machine. It's hard to go anywhere these days without hearing something about the urgent need to deploy on-premises cloud environments that are agile, flexible and don't cost an arm and a leg to build and maintain, but getting your hands on a real OpenStack cluster—the de facto standard—can be downright impossible.

Steven Rostedt wanted to do a little housekeeping, specifically with the function tracing code used in debugging the kernel. Up until then, the kernel could enable function tracing using either GCC's -pg flag or a combination of -pg and -mfentry. In each case, GCC would create a special routine that would execute at the start of each function, so the kernel could track calls to all functions.

Learn a few techniques for avoiding the pipe and making your command-line commands more efficient. Anyone who uses the command line would acknowledge how powerful the pipe is. Because of the pipe, you can take the output from one command and feed it to another command as input. What's more, you can chain one command after another until you have exactly the output you want.

One of the most crucial pieces of any UNIX-like operating system is the init dæmon process. In Linux, this process is started by the kernel, and it's the first userspace process to spawn and the last one to die during shutdown.