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A fun little article about how to display a custom login banner or motd in the Linux terminal.

In-depth look at the Linux tail command including it's basic usage and it's more advanced usage like tailing rotating log files and exit on pid termination.

In this deep dive we take a look at the "at" utility suite. We discuss how to use at to schedule one-time jobs, how to manage, list and delete scheduled jobs. Learn to use different queues, and schedule jobs to run only when system load averages permit using the batch feature. Of course, we also touch on how to secure use of the at command.

Using lock files as job control for Linux bash scripts. Learn how to create a basic lock file, locking files with flock and see examples of each.

Learn how to find and delete empty directories and files on the Linux command line using the find command and some of it's options.

How to safely create temporary files and directories to be used in Linux shell scripting. Learn some of the security concerns related to temporary files and how to implement best practices.

Learn how to get your systems IP address information from the Linux command line using various tools including nmcli, hostname and ip commands.

Discussion on different methods to create an encrypted archive and the pros and cons of each.

Learn how to mitigate the ICMP timestamp vulnerability in Linux by blocking certain types of Internet Control Message Protocol at the firewall.

Learn the difference between hard link and soft links in Linux and how to create them with examples.

How to generate a random number from the Linux command line. We will explore how to generate a random number within a range and also a specific length.

Learn about 5 interesting Linux tools that will help break your dependence on the GUI and keep you productive on the command line.

How to use the Linux rev Command to reverse characters in text files and strings. We also explore 3 practical uses for the rev command.

Learn how to create systemd timer units to schedule jobs. We also discuss the benefits of using timer units over cron jobs.

In this short tutorial we take a look at the SECONDS built in shell variable. We discuss what it is, how to use it and formatting it to cleanly display the time a shell script took to execute.

A fun a lighthearted look at the Linux yes command. A little something different to break the monotony, of all the hardcore Linux that has gotten to be, a little bit out of control it's cool to enhance. But what about a piece that soothes and moves jubilance.

Learn how to print the time a command took to execute. Take a dive deep into the differences between the time shell keyword and the time binary executable. We also use experimentation to demonstrate the pros and cons of each.

Today we are taking an exhaustive look at the tr command. We learn how to substitute, delete and squeeze characters on the command line. We also take an in-depth and interesting look at two cryptic options, the complement option as well as truncate, which does not do what you think.

Learn how to use pwquality pam module to create a password policy in Linux. We also discuss the use of character credits and how they effect your policy.

Deleting a user is simple right... Not so fast. There can be some residual security risks. In this short article we discuss how to delete a user, possible security implications and how to avoid them.