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Introduction to Linux - A Hands on Guide
This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.
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Here's a post about common mistakes I see made with SSH. A few shortcuts to being more productive when you have a complicated server network. And other neat tips and tricks.
The most common problem I see new users attempting to use public key auth is to get the permissions wrong either on their home directory, .ssh directory, or authorized_keys file. Luckily, the openssh project provides a helpful FAQ answer.
Yesterday I was trying to implement a feature allowing me to unforward the ports while connected. Here is current development progress(which is stopped atm) but the beta-version of solution has been released.
p.s. I also posted that to OpenSSH developers.