Booting to a Linux Desktop and Opening a Terminal - Linux Training Online - Linux Concepts & Terms

To learn linux concepts and get linux training that you can understand, you need to understand linux terms - the linux "lingo".

Articles with names ending in "linux Concepts & Terms", have been created to help you learn linux "geek-speak" (terms) - and this will help you learn how to use Linux!

Booting Linux to a Linux Desktop

As a new Linux user, the easiest way to work with linux is by booting to a linux desktop. A linux desktop provides an easy method of running linux software programs, by double-clicking on icons or using menus on the desktop.

A linux desktop also allows you to easily open a terminal emulation window to run linux commands.

Using a linux Terminal (Terminal Emulation Window)

A terminal emulation window is also referred to as a "linux terminal", "linux console" or just "terminal" or "console".

linux Tips: When you are new to linux, use a version of linux that has a desktop installed and that boots to the linux desktop. Many linux servers are set up to simply boot to a linux console Login: prompt - and not a linux desktop.

To run linux administration commands, you need to work as the root user. However, for security reasons, you should never log in to a linux desktop as the root user.

Working as the Root User to Do linux system Administration Tasks

To work as the root user from a linux desktop: log in to the desktop as a regular user, open a terminal emulation window and run the su command, with the - (dash) option.

Now imagine watching a linux video tutorial that shows you how to: log in to a linux desktop, open a terminal emulation window on the desktop to run linux commands - and explains why you use these different methods of getting to the linux command line prompt.

You can watch a friendly, easy, step-by-step, presentation that shows you all you need to know - explaining all the linux concepts and terms along the way - easy linux training all the way!

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Inexpensive PCs as CNC Machine Controllers

part I, Utilizing an off the shelf PC as a CNC controller

There are two main groups that can take advantage of todays low cost PCs as an effective and inexpensive CNC controller.

Retrofits to existing CNC machines with outdated or proprietary controls in need of service.

Shop built and home built CNC machines.

Inexpensive PCs can cost as little as $150.00 and yet provide a dependable and effective CNC machine controller. Some sources to consider for obtaining such a system are outpost.com and dell.com. Oupost.com is an outlet for Frys electronics. They have one PC on sale ranging from $150.00 to $199.00. Several have successfully used this PC in conjunction with MACH2 CNC controller software.

Tradeoffs: price vs. Quality. With the lowest cost PCs there a tradeoff in performance, quality, and reliability. The manufacturers of these machines use low cost hardware in their manufacture and they make compromises in the design of the systems to keep their costs down. Inexpensive hardware translates directly to a higher failure rate and more difficult to obtain manufacturer support. This can be a deciding factor by itself if you rely on this machine for production.

design compromises which are common in low cost PC have an impact on performance. The primary concerns are: insufficient memory, the use of shared memory, and on-board graphics devices. The primary hardware requirements for a PC based CNC controller are sufficient memory, and sufficient processor speed. You can see that the compromises present in these systems are in direct opposition to the requirements for CNC controller.

At the bottom end of the Inexpensive PC market there are off the self solutions that will function well as a PC based CNC controller. As with all things, you tend to get what you pay for, so the buyer is advised to be aware of the requirements and limitations that are in play.

part II in this series of articles will examine an alternative to buying an off the shelf solution and explore building a PC to meet your specifications.

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