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The most common interactions with a computer nowadays are done through a Graphical User Interface (GUI). Before GUIs existed, users would interact with a computer via shell programs, a Command Line Interface (CLI) to run other programs. Despite the ubiquity of GUIs, interacting with a computer via a CLI is...
Marcus Sanatan
The cURL utility is a command line program often bundled with Unix/Linux distributions and Mac OSX operating systems. It allows you to send just about any type of HTTP request via the command line, which is great for many things, ranging from posting data to a REST API to...
Scott Robinson
SSH, or Secure Shell, is a very common way to securely access remote machines, typically via the command line. It aims at ensuring that your connection, and therefore all data passed, is free from eavesdropping. Because of this, there are quite a few checks built-in to the popular SSH clients,...
A lot of tools output data as comma-separated values (CSV). It is a simple but common tabular data format of plain text that can easily be processed. Each line of the file represents a single record. A record consists of the same number of fields, or columns. Usually, the delimiter...
Frank Hofmann
UNIX/Linux systems offer special mechanisms to communicate between each individual process. One of these mechanisms are signals, and belong to the different methods of communication between processes (Inter Process Communication, abbreviated with IPC). In short, signals are software interrupts that are sent to the program (or the process) to...
In this tutorial, we will show you how to permanently set your PATH on Linux. First off, why should you care? The $PATH variable, or just PATH, without the $ indicating variables, specifies a list of directories that impacts your computing platform's functionality in a critical way. This is because the...
Tendai Mutunhire
This topic is essential knowledge for every user of UNIX, Linux, Solaris, OS X, and BSD. Furthermore, the LPI certification contains tricky questions about this. If you want to find files with a certain filename using the command line then use either the find or the locate commands. But if...
Different file systems in the UNIX/Linux universe allow a variety of entries such as regular files, directories, sockets, named pipes, and links. In this article I will explain to you what links are, which types of links exist, how to create a symbolic link, and how to detect broken...
In this article we'll show you the various methods of looping through arrays in Bash. Array loops are so common in programming that you'll almost always need to use them in any significant programming you do. To help with this, you should learn and understand the various types of arrays...
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