Tags: command

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ampersand
In Bash, you use the ampersand (&) as the AND operator; learn more in this tutorial.

Logical & in Bash

One would think you could dispatch & in two articles. Turns out you can't. While the first article dealt with using & at the end of commands to push them into the background and then diverged into explaining process management, the second article saw & being used as a way to refer to...
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Getting Started with the cat Command

The Linux cat and zcat commands are more useful than you may realize. Cat is a fairly simple tool designed to concatenate and write file(s) to your screen, which is known as standard output (stdout). It is part of the GNU Core Utils released under the GPLv3+ license. You can expect to find it in...
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ampersand.png

ampersand
This tutorial takes a closer look at the ampersand (&) and the various ways it can be used at the command line.

And, Ampersand, and & in Linux

Take a look at the tools covered in the three previous articles, and you will see that understanding the glue that joins them together is as important as recognizing the tools themselves. Indeed, tools tend to be simple, and understanding what mkdir, touch, and find do (make a new directory, update...
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shortcut
Linux shells let you chain commands together to carry out sophisticated operations in one fell swoop and create aliases to act as shortcuts.

Aliases: To Protect and Serve

Happy 2019! Here in the new year, we’re continuing our series on aliases. By now, you’ve probably read our first article on aliases, and it should be quite clear how they are the easiest way to save yourself a lot of trouble. You already saw, for example, that they helped with muscle-memory, but...
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aliases
Learn how to create aliases -- commands you build yourself by packing them with other instructions that are too long or too hard to remember.

Aliases: DIY Shell Commands

Aliases, in the context of the Linux shell, are commands you build yourself by packing them with combinations of other instructions that are too long or too hard to remember. You create an alias by using the word alias, then the name of the command you want to create, an equal sign (=), and then...
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How to do Basic Math in Linux Command Line

The Linux bash, or the command line, lets you perform both basic and complex arithmetic and boolean operations. The commands like expr, jot, bc and, factor etc, help you in finding optimal mathematical solutions to complex problems. In this article, we will describe these commands and present...
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Schedule One-Time Commands with the Unix at Tool

Cron is nice and all, but don't forget about its cousin at. ...even though I've been using Linux for 20 years, I still learn about new (to me) command-line tools all the time. In this "Back to Basics" article series, I plan to cover some of the command-line tools that those new to Linux may never...
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How to See What's Going on With Your Linux System Right Now

Is that service still running? What application is using that TCP port? These questions and more can be answered easily by sysadmins who know simple Linux commands. If you're a system administrator responsible for Linux servers, it's essential that you master the Bash shell, especially the commands...
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How to Use dd in Linux Without Destroying your Disk

Whether you're trying to rescue data from a dying storage drive, backing up archives to remote storage, or making a perfect copy of an active partition somewhere else, you'll need to know how to safely and reliably copy drives and filesystems. Fortunately, dd is a simple and powerful image-copying...
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groups
Learn how to work with users, via groups and access control lists in this tutorial.

How to Manage Users with Groups in Linux

When you administer a Linux machine that houses multiple users, there might be times when you need to take more control over those users than the basic user tools offer. This idea comes to the fore especially when you need to manage permissions for certain users. Say, for example, you have a...
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