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How to Create a Site-to-Site IPsec VPN Tunnel Using Openswan in Linux

A virtual private network (VPN) tunnel is used to securely interconnect two physically separate networks through a tunnel over the Internet. Tunneling is needed when the separate networks are private LAN subnets with globally non-routable private IP addresses, which cannot be interconnected using traditional routing over the Internet. For example,...

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RAW Sharpening and Noise Reduction With Raw Therapee on Linux

In this introduction to Raw Therapee you will learn how to use its advanced tools for noise reduction and sharpening your digital photos.

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15 Practical Examples of ‘echo’ Command in Linux

echo is one of the most commonly and widely used built-in command for Linux bash and C shells, that typically used in scripting language and batch files to display a line of text/string on standard output or a file. 

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How to Configure Access Control Lists (ACLs) on Linux

Working with permissions on Linux is rather a simple task. You can define permissions for users, groups or others. This works really well when you work on a desktop PC or a virtual Linux instance which typically doesn't have a lot of users, or when users don't share files among...

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What Are Useful CLI Tools for Linux System Admins

System administrators (sysadmins) are responsible for day-to-day operations of production systems and services. One of the critical roles of sysadmins is to ensure that operational services are available round the clock.

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