This document is good for Linux newbies to have a basic of Linux administration knowledge. If you want to have real time experience on Linux with expert trainers refer this link.
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For Linux users, "Convert" is a good comment to add text to images. We are also in exploring Linux OS and sharing with our students. If anyone is looking for building skills in Linux administration, then refer this link.http://www.kerneltraining.com/linux-admin-training/.