Unix as a Second Language
Scheduling tasks on Linux using the at command
The at command makes it easy to schedule Linux tasks to be run at any time or date you choose. Check out what it can do for you.
Tricks for getting around your Linux file system
The cd command is probably one of the first 10 that any Linux user learns, but it's not the only way to navigate the Linux file system.Here are some other ways.
Linux firewall basics with ufw
We take a look at ufw - the uncomplicated firewall - on Linux, providing some insights and commands for making changes.
Manually rotating log files on Linux
Linux system log files are by default set to rotate. Depending on the age or size, a sequence of files moves back a step, the oldest being removed and a new one taking over as the current log file. When needed, however, you can...
Viewing and configuring password aging on Linux
With proper settings, Linux users can be forced to periodically change their passwords. Here's how to view password aging settings and how to configure some of the settings.
Communicating with other users on the Linux command line
Linux systems offer a number of easy commands for sending messages to other logged in users. In this post, we examine some very handy messaging tools.
Watching activity on Linux with watch and tail commands
The watch and tail commands can help monitor activity on Linux systems. This post looks at some helpful ways to use these commands.
Converting between uppercase and lowercase on the Linux command line
Converting text between uppercase and lowercase can be very tedious, especially when you want to avoid inadvertent misspellings. Fortunately, Linux provides a handful of commands that can make the job very easy.
How to find what you’re looking for on Linux with find
The find command has a huge array of options to help you locate exactly the files you're looking for on a Linux system. This post explores a series of extremely useful commands.
Digging up IP addresses with the Linux dig command
The dig command is extremely versatile both for retrieving information from domain name servers and for troubleshooting.
Navigating man pages in Linux
The man pages on a Linux system can do more than provide information on particular commands. They can help discover commands you didn't realize were available.
Intro to the Linux command line
Here are some warm-up exercises for anyone just starting to use the Linux command line. Warning: It can be addictive.
Showing memory usage in Linux by process and user
There are several commands for checking up on memory usage in a Linux system, and here are some of the better ones.
Setting up passwordless Linux logins using public/private keys
Using a set of public/private keys to allow you to log into a remote Linux system or run commands using ssh without a password can be very convenient, but setup is just tad tricky. Here's how and a script to help.
Locking and unlocking accounts on Linux systems
There are times when locking a Linux user account is necessary and times when you need to reverse that action. Here are commands for managing account access and what's behind them.
Generating numeric sequences with the Linux seq command
The Linux seq command can generate lists of numbers and at lightning speed. It's easy to use and flexible, too.
Unix is turning 50. What does that mean?
Unix time, also known as 'epoch time,' is the number of seconds that have passed since Jan 1, 1970. As Unix turns 50, let's take a look at what worries kernel developers.
How to tell if you’re using a bash builtin in Linux
A built-in is a Linux command that's part of whatever shell you're using. Can you tell what commands are built-ins and which are not?
7 ways to remember Linux commands
Linux commands run from the nearly obvious to the very complicated, but there are many ways that you can easily remember and use even the most obscure commands.
Breaking Linux files into pieces with the split command
Some simple Linux commands allow you to break files into pieces and reassemble them as needed. In this post, we'll look at the split command and some of its more useful options.
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