Tutorials

The expr command in Linux – Evaluate Expressions and Perform String Operations

The expr command in Linux evaluates a given expression for you and displays the output. It also lets you perform certain string operations such as finding length, substring and more. In this tutorial, we will learn how to perform these operations. First, we will look at the arithmetic operations and then move on to the

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The install command in Linux – Copy files, Create Directories, Change User permissions and File ownerships

The install command in Linux copies files and sets file attributes. It is not to be used for installing packages. For installing packages on to your Linux system you should use apt command or yum command. In this tutorial, we will learn how to use the install command for copying files and changing file attributes.

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The bc command in Linux – How to Perform Mathematical Operations in Linux Shell?

The bc command, short for basic calculator, is a language that supports arbitrary precision numbers with interactive execution of statements. Its syntax is similar to that of C programming language. It has two major applications. One as a mathematical scripting language and the second as an interactive mathematical shell. In this tutorial, we will learn how to

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The iostat Command in Linux – Monitor and Generate CPU and Device Utilization Reports

The iostat command in Linux lets you monitor CPU utilization and I/O (input /output) statistics of all the disks and file systems. Iostat reports are useful for changing system configuration to better balance the input/output load between physical disks. This command is a must-know for Linux system administrators. In this tutorial, we will be learning

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