Linux

Ways to look at logged in users on Linux

Linux provides a lot of useful commands for looking at users, their activity and their impact on the system.

Looking at user login time with the ac command

The ac command can provide very useful summaries of how much time users spend logged into a Linux system. It gets its data from the wtmp file.

Bash: A primer for more effective use of the Linux bash shell

There are lots of sides to bash and much to know before you're likely to feel comfortable snuggling up to it. This post examines many aspects of this very popular shell and recommends further reading.

Counting individual characters on Linux

If you need to count how many of each character is included in a file or phrase, there are some handy commands you can string together to accomplish this along with scripts and aliases that can make the job easy.

Finding and fixing typos on Linux

The Linux aspell and enchant tools can both ID typos in text files and suggest replacements.

Using Wikipedia from the Linux command line

A tool called wikit provides an easy way to get information from Wikipedia without leaving the Linux command line.

Using functions in bash to selectively run a group of Linux commands

Using bash options to change the behavior of scripts

Here are some of the more popular bash options to control how scripts work on Linux and how to list the available options, including seeing which ones are turned on.

Using ‘break’ and ‘continue’ to exit loops in bash

As nice as looping in Linux scripts can be, you might just want to interrupt it sometimes, and the break and continue commands can do this.

Linux Foundation to blaze a path forward for mainframes

The Linux Foundation's Open Mainframe Project is targeting the development of mainframe applications and skill sets, and now has its own Big Iron to work with.