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How to use the ls command: 2-Minute Linux Tips

In this Linux tip, learn how to use the ls command. The ls command is one of the most basic commands. It’s used to list files and it has some very useful options.

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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.

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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.

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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.

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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.

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How to use the ssh keygen command: 2-Minute Linux Tips

In this Linux tip, learn how to use the ssh-keygen command. It’s used to create a set of public/private keys that you can use in place of passwords to either log into a system or run commands remotely.

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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.

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How to background a process: 2-Minute Linux Tips

In this Linux tip, learn how you can move a running task into the background and what that means. Once you use the bg command, you have the ability to run other commands.

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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.

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How to use the lsof command: 2-Minute Linux Tips

In this Linux tip, learn how to use the lsof (list open files) command. To properly list all open files, you should use sudo. Otherwise you’re likely to run into a lot of Permission Denied warnings.

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How AppArmor can protect your Linux system

AppArmor is a Linux-kernel security module that offers unique benefits.

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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.

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How to use apparmor: 2-Minute Linux Tips

In this Linux tip, learn about apparmor. It’s a security module that runs by default on certain Linux systems – like newer Ubuntu and Debian. Apparmor enforces restrictions using file system paths while SELinux applies security labels...

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How to use the wget command: 2-Minute Linux Tips

In this Linux tip, learn the wget command. It makes downloading pages from web sites – even recursively – very easy. Keep in mind that this command downloads whatever html code defines the page.

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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.

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How to use the du command: 2-Minute Linux Tips

In this Linux tip, we’re going to look at the du command that reports on disk usage – whether individual files or directories.

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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?

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How to use the split command: 2-Minute Linux Tips

In this Linux tip, we’re going to look at the split command that breaks files into pieces --according to your instructions if you like -- and gives the pieces sequential names.

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