Last month, I have come across how to choose Unix, with which UNIX to choose, commercial UNIX, and open source UNIX, lets see how the “Brands of commercial UNIX“and “Brands of open source UNIX”.

Brands of commercial UNIX
Some of the most famous and widely used brands of UNIX include Sun’s Solaris and Hewlett Packard’s HP-UX.

Solaris is a binary-compatible operating system, which means that Sun have gone to some lengths to ensure that one version of their UNIX will run on all of their hardware. Solaris also features integrated Java support, although Java can be downloaded for any UNIX
distribution.

Sun also manufacture UNIX for Intel hardware as well as their own proprietary hardware. (more…)

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While the Linux variant of UNIX is fast becoming a desktop operating system, UNIX’s multiuser capabilities make it ideally suitable in a server role.

When tasked as a web or database server, a properly configured UNIX system will provide unparalleled periods of uptime, requiring little service. The structure of UNIX means that in the case of a hardware failure, sections of a data structure can be taken offline, replaced and put online again without shutting down the system. This makes UNIX a good choice for mission critical applications.

UNIX’s multi-user capabilities make it highly resistant to attack. It’s designed in such a way that even if a malicious party did gain access to the system, their activities would be restricted to the user account they had access to, leaving them unable to damage critical system resources. (more…)

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When I google around some latest Ubuntu OS, found a collection of Ubuntu eBook. For those who can read eBook and fans of Open Source, this series of Ubuntu eBook is a best collection for you.

Here the list of eBook (more…)

Posted by calvyn | 1 Comment »

Text processing is different than word processing. In word processing, text is edited and manipulated in a “What-You-See-Is-What-You-Get” (WYSIWYG) environment. This enables you to produce printed copies of the text, complete with features such as graphics and tables.

Linux stores files in plain-text format. This allows you to use different processing, or filtering, utilities on the text. These utilities let you format, analyze, and manipulate text in many different ways. For example, you can format pages and paragraphs, check spelling, add page numbers and headers, and count the lines, words, and characters that a file contains.

Text-processing utilities

The general command syntax used for text-processing commands is

command [option ] filename(s)

Reading files
To work with files, you need to know what information they contain. One way of doing this is to use the cat command to display the contents of a file on your terminal screen. This command provides a number of options.

Options for the cat command

Viewer commands
A quicker way of viewing the contents of a file is by using viewer commands, which display the information at the start or end of a file. Examples of viewer commands include head and tail.

By default, the head command displays the first 10 lines of a file, and the tail command displays the last 10 lines of a file. Additional options can be used with these commands to view more specific areas of a file. For example, you can use the -n option with the commands to specify the number of lines they must display.

Pager commands
If a particular file is longer than one screen, it may scroll past too quickly for you to read it. You can scroll through documents at your own pace by using pager commands, which display documents one screen at a time. Examples of pager commands include less and more.

The more command is the original pager command and derives from the Berkeley version of UNIX. It enables you to move through a document in a forward direction only.

The less command was developed to replace the more command and provides a wider range of options for viewing files.

Pager command options

Posted by calvyn | 2 Comments »

Defragmentation is a process that helps to reduce the amount of fragmentation in your file systems. Same as file fragment, disk fragments, they are created by the allocation of file in the magnetic disk.

This happens when we create, delete, move, update and copy files from one location to another. This is because our computer system cannot or have not enough contiguous space to store a complete file as a unit and instead puts parts of it in gaps between other files. In long time period, the accumulation of fragments in hard disk become bigger and bigger, it will affects the system performance, your will feel the processing become slower and slower. In the end, system slowdown, system files crash, or even more serious will decrease hard disk life span.

So, I would like to introduce a helpful application called Advanced Defrag to help you do disk defragmentation. (more…)

Posted by calvyn | 2 Comments »