The idea of a restricted shell first arose in the Unix operating system in order to prevent the end-user from doing as many operations as a normal shell allows. A restricted shell lets the administrator control the end-user’s computing environment by only permitting explicitly used commands to be used.

The vi editor (visual editor) is one of the oldest and more popular text editors on computers running the Unix Operating System (OS). The vi editor can be used from any computer terminal interfacing with a computer running Unix, since the editor relies on the standard alphabet keys for specific commands.

A computer process is a computer program that is executing and has a unique process identification or PID. On the Unix Operating System (OS), a process may be running in the background, foreground, or be in a suspended state. On Unix, the OS shell will not return the prompt to the end-user until the current process that is executing finishes.

The grep utility is the term that refers to the collection of Unix and more recently LINUX tools that conduct searching tasks on the computer. The grep utility is used to search file contents for information matching the search criteria included with the command. The three search options available on Unix computers include grep, egrep, and fgrep.

Linux is a free, open source operating system that competes with the Windows Operating Systems and Mac OS X. Linux is widely used on a number of devices such as servers, desktops, laptops, smartphones, PDAs, game consoles, tablet computers, supercomputers, and mainframes. Linux controls only about 4.

Most often, when uninstalling Ubuntu–the most widely used version of Linux–what the person is done is replacing it with Windows. Therefore, to uninstall Ubuntu and therefore replace it with Windows, one must format the partition during the installation of Windows.

CAD programs can be an exciting and helpful tool when designing blueprints for a house, vehicle, or electrical circuit. One of these programs is the popular LinuxCAD software that allows you to edit and create a number of blueprints and schematics under the Linux operating system.

Unix Shell Scripting Tutorials
This Unix shell scripting tutorial provides samples and instructional materials that are easy to understand and useful for Unix shell scripting. It also offers illustrated samples that will helps users explore different avenues of Unix shell scripting.

Securing Linux Installation
Installing Linux for securing your server depends upon how to install Linux on desktop or server. Installing Linux from untrusted source would not help in potentially securing your server and overcome on other security issues.