Linux, The grimoire of a modern Linux professional

Every system administrator daily use SSH to connect to remote systems and perform they daily tasks: the very most of the time these consist into typing statements on the terminal or copying files from and to the remote system, or again running remote commands, but SSH is much more than this: it not only provides additional facilities such as agent or forwarding, port forwarding and X11 forwarding, but it has also a subsystem that can be exploited to provide SSH secured services such as SFTP.

The goal of the "OpenSSH Tutorial - The Ultimate SSH Guide To Understand It" post is to tell you what historically drove us to SSH, describe the protocol suite in detail and provide a thorough tutorial on using all of these facilities.

SSH is a huge topic: thoroughly explaining both server and client side would require much more than a single post - actually even just explaining server side would deserve several posts. For this reason this post shows only the minimum required settings that are required server side to enable the features that are instead thoroughly described client side. In addition to that, some parts of this post are a little bit redundant, but it was the only way I found to clearly explain how things work from the client perspective and from the server perspective.

This post is based on Red Hat Enterprise Linux 9, but the same concepts apply to the very most of the Linux distributions.

Every time you interact with a computer, either using a command line or graphically, you are using a console. Despite its ease of use, a console must address and solve a lot of compatibility problems, for example properly interpreting control characters that may differ from terminal to terminal.

Being able to customize settings such as locale and keyboard layout is the basis, but it is not enough: , having at least a basic understanding of how a console works under the hood is certainly a valuable skill that lets you quickly and easily address some uncomfortable situations that sometimes arise, especially when connecting to old systems that, in the face of security best practices, for various reasons after decades are still there without being updated, maybe because very are running obsolete services that are not compatibles with up to date operating systems.

The "Linux Console Essential Virtual Terminals Terminal Emulation and configuring locale" post is meant to provide you everything it is necessary to know to solve the most common problems that may arise concerning the Linux console and locale.

OpenSSH Tutorial – The Ultimate SSH Guide To Understand It

Linux Console Essential – Virtual Terminals, Terminal Emulation and configuring locale