Category Archives: Linux

23 tar Command Examples For Linux

Tar Archive Command Examples For Linux

The GNU tape archive command, known as ‘tar’, is used to store many different files together into a single archive file. This makes it easy to perform backups and restores of files and directories in Unix/Linux based operating systems.

The practical examples in this guide will show you how to use the tar command in all sorts of different situations.

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16 Simple cat Command Examples For Linux

Cat Command Examples For Linux

The ‘cat’ command is used to read and concatenate files, printing them out to standard output.

Cat comes from the GNU Coreutils package and should be available by default in Unix/Linux based operating systems.

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21 Simple ls Command Examples For Linux

ls Command Examples For Linux

The ‘ls’ command is a standard GNU command used in Unix/Linux based operating systems to list directory contents and display information about the sub directories and files within.

The practical examples in this guide will show you how to use the ls command in all sorts of different situations.

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20 wget Command Examples For Linux

Wget Command Line Examples For Linux

Wget is a non-interactive network downloader which can be used for downloading files in Unix/Linux. It supports the HTTP, HTTPS and FTP protocols and also has proxy support.

The wget command is quite powerful and has a lot of options available, in this guide we’ll be covering 20 of the most important wget examples that will help you learn how to best use it.

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Managing Swap Space In Linux

Managing Swap Space In Linux

Swap space is an area of disk that is used to store memory to. Here we’ll take a look at managing swap space in Linux by determining what is actually using the swap space, controlling how frequently swap space is written to, and finally adding additional swap space if required.

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25 Useful yum Command Examples For Package Management In Linux

How To Use Yum - Command Examples

Yellowdog Updater Modifier (yum) is an RPM based package manager which is used to install and update packages in various Linux distributions including CentOS, RHEL and Fedora.

Yum is quite powerful as it’s capable of automatically resolving dependency issues, and is similar to other package managers such as ‘apt-get’ in Debian based distributions.

These examples should serve as a useful introduction, guide or cheat sheet style resource for how to use the yum command in Linux.

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17 Bash History Command Examples In Linux

Bash History Command Examples In Linux

The ‘history’ command available in Bash can be used to simply display your shell history, however there’s also a whole lot more that you can do with it, which we’ll demonstrate here.

Bash history allows us to quickly see what has been executed previously on a system, allowing you to hold users at least somewhat accountable for their actions (more on this later). It’s also useful if you’ve run something before and forgot the command, I can’t begin to tell you the number of times that I’ve done this!

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How To Enable Or Disable SELinux In CentOS/RHEL 7

How To Enable Or Disable SELinux

Security Enhanced Linux (SELinux) is enabled and running in enforcing mode by default in CentOS/RHEL based Linux operating systems, and with good reason as it increases overall system security.

Despite this there may be times when you want to temporarily or permanently disable SELinux, which is what we’ll cover here.

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How To Reset Root User Password In CentOS/RHEL 7

How To Reset Root Password In Linux CentOS/RHEL 7

Normally resetting the root password is a simple task if you’re logged in already with root privileges, however if you forget the password and need to change it things become a little more difficult.

The process has changed from CentOS/RHEL (Red Hat Enterprise Linux) version 6 to 7, as previously you would boot into single user mode and then change the password as root. From version 7 the equivalent modes are the rescue or emergency targets, however these require the root password before you can do anything which doesn’t help us here, so we’ll take you through the new process to change the lost root password.

This is also a task that you will need to know how to perform for the RHCSA exam.

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How To Install PowerShell On Linux

How To Install PowerShell On Linux

Earlier this month Microsoft announced that PowerShell had been open sourced and would be available for use in Linux. As a result of this, PowerShell is now available for Ubuntu 14.04 and 16.04, CentOS/RHEL 7, and macOS 10.11.

If your first thought is along the lines of “who would use this abomination?”, then you’re in good company. My best thought at who this is targeted towards is the Windows system administrator that needs to be able to manage Linux systems as they are likely already quite familiar with PowerShell and perhaps unwilling to change.

Personally I’d look at using a tool such as Puppet for managing systems running various operating systems, however here’s how you can install PowerShell in Linux should you want to take this path.

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