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Linux security

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Viewing files and processes as trees on Linux

A look at three Linux commands - ps, pstree and tree - for viewing files and processes in a tree-like format.

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How the Linux screen tool can save your tasks – and your sanity – if SSH is interrupted

The Linux screen command can be a life-saver when you need to ensure long-running tasks don't get killed when an SSH session is interrupted. Here's how to use it.

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

Learn the expr command. It allows you to do mathematical calculations on the command line.

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3 quick tips for working with Linux files

Linux provides lots of commands for finding, counting, and renaming files. Here's a look at some useful choices.

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

Learn how to use the ac command. It reports on user login times, so if you’re interested in knowing how much time various users are spending on a Linux server, this command is a good choice.

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How to remove carriage returns from text files on Linux

When carriage returns (also referred to as Ctrl+M's) get on your nerves, don't fret. There are several easy ways to remove them.

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How to freeze and lock your Linux system (and why you would want to)

What it means to freeze a terminal window and lock a screen -- and how to manage these activities on your Linux system.

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

Learn how to use the sudo command. It’s a very important command for Linux security because it provides a way for individual users to run specific commands with the authority of root.

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How to use Terminator on Linux to run multiple terminals in one window

Providing an option for multiple GNOME terminals within a single window frame, terminator lets you flexibly align your workspace to suit your needs.

2-Minute Linux Tip: The env command

Use the env command to learn how to gather info about your shell environment on Linux.

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

Learn how to use the env command. The most useful thing it does is to provide information on your shell environment when you’re working on the Linux command line.

Unix as a Second Language: The touch command

The Linux touch command allows users to create an empty file or update a file’s data and time settings. You might want to do this if you need to be sure that a file exists before a script or process begins. The command can also be...

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

In this Linux tip, learn how to use the touch command. It allows you to create an empty file or update a file’s last updated date/time settings.

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Celebrating Linux's 28 years

Linux just turned 28, and in that time, it has moved from being an interesting project to what is in many ways the most significant operating system, spawning hundreds of distributions and taking over the field of supercomputing.

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How to rename a group of files on Linux

To rename a group of files with a single command, use the rename command. It requires the use of regular expressions and can tell you what changes will be made before making them.

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A guided tour of Linux file system types

Linux file systems have evolved over the years, and here's a look at file system types

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

Learn the wc command. It provides an easy way to count the lines, words and characters in a file or in output from some other command.

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Keeping track of Linux users: When do they log in and for how long?

Getting an idea how often your users are logging in and how much time they spend on a Linux server is pretty easy with a couple commands and maybe a script or two.

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