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Learn 10 good UNIX usage habits

Post date: December 16, 2006, 14:12 Category: Miscellaneous Views: 3288 Comments
Tutorial quote: Adopt 10 good habits that improve your UNIX® command line efficiency -- and break away from bad usage patterns in the process. This article takes you step-by-step through several good, but too often neglected, techniques for command-line operations. Learn about common errors and how to overcome them, so you can learn exactly why these UNIX habits are worth picking up.

Bourne / Bash shell scripting tutorial

Post date: October 11, 2006, 20:10 Category: Programming Views: 6085 Comments
Tutorial quote: A Bourne Shell Programming/Scripting Tutorial for learning about using the Unix shell. Learn linux / Unix shell scripting by example along with the theory. We'll have you mastering Unix shell scripting in no time!

Removing A User

Post date: April 8, 2006, 00:04 Category: System Views: 3925 Comments
Tutorial quote: Employee turnover in most organizations runs high. So unless you run a small shop with a stable user base, you need to learn how to clean up after an employee leaves. Too many so-called system administrators do not understand the stakes involved when they manage users. Disgruntled former employees can often cause significant trouble for a company by gaining access to the network.

To remove a user, you need to learn to manage all of his or her files, mailboxes, mail aliases, print jobs, recurring –(automatic) personal processes such as the backing up of data or remote syncing of directories, and other references to the user. It is a good idea at first to disable the account in /etc/passwd, after which you can search for the user's files and other references. Once all traces of the user have been cleaned up, you can remove the user completely—but if you remove the entry from /etc/passwd while these other references exist, you have a harder time referring to them .

When you remove a user, it's a good idea to follow a pre-determined course of action so you don't forget any important steps; it may even be a good idea to make a checklist so that you have a routine. Following, you will find several items requiring attention.

How To Limit CPU Usage Of A Process With cpulimit (Debian/Ubuntu)

Post date: September 14, 2009, 09:09 Category: Miscellaneous Views: 3323 Comments
Tutorial quote: This tutorial shows how you can limit the CPU usage of a process with the tool cpulimit on Debian/Ubuntu. cpulimit is a simple program that attempts to limit the CPU usage of a process (expressed in percentage, not in cpu time). This is useful to control batch jobs, when you don't want them to eat too much CPU. It does not act on the nice value or other scheduling priority stuff, but on the real CPU usage. Also, it is able to adapt itself to the overall system load, dynamically and quickly.

Monitoring disk space and usage

Post date: June 17, 2006, 15:06 Category: Software Views: 4454 Comments
Tutorial quote: Monitoring disk space is a vital part of your job as a UNIX administrator. This article gives you the tools you need to be successful, including the use of df, du, find, and even the use of quotas. Let's get started by taking a look at how useful df can be.

Good-looking fonts in X Windows

Post date: April 23, 2005, 09:04 Category: Desktop Views: 2469 Comments
Tutorial quote: What makes the difference betweek "ugly" and "beautiful" fonts? Several things.

One of them is anti-aliasing (or AA in short). It's the technique which adds gray pixels in various shades around the edges of black text and thus blurs the jagged and pixelated edges. It works with other colors, too.

Another thing is having good quality fonts to start with. Font which are ugly by nature or don't scale well to various sizes are not much nicer when anti-aliased. See what kinds of fonts are out there by browsing through the Font HOWTO (not the same as the FDU HOWTO above).

Finally, there's the issue of readability which applies to you directly. How well does the end-product look anyhow? Do you really need anti-aliasing for an 8 pixel text? And other similar questions, which you'll learn how to answer according to your own preferences.

Conky - Lightweight system monitor in openSUSE

Post date: May 11, 2009, 22:05 Category: System Views: 5328 Comments
Tutorial quote: Conky is a free, light-weight system monitor for X, that displays any information on your desktop. Conky is licensed under the GPL and runs on Linux and BSD. Conky has more than 250 built in objects, including support for a plethora of OS stats (uname, uptime, CPU usage, mem usage, disk usage, “top” like process stats, and network monitoring, built in support for IMAP and POP3 and many popular music players (MPD, XMMS2, BMPx, Audacious).

Monitoring your bandwidth usage with vnstat

Post date: January 14, 2006, 20:01 Category: Network Views: 3012 Comments
Tutorial quote: There are many occasions where it is useful to have an idea of your bandwidth usage, perhaps to know when you're going to be charged more by your ISP, or perhaps just as part of general monitoring. The vnstat tool is a simple means of doing just that.

ntop in openSUSE to probe & monitor Network Traffic

Post date: April 10, 2009, 07:04 Category: Network Views: 5891 Comments
Tutorial quote: ntop is a free opensource network traffic probe that shows the network usage. ntop is based on libpcap and can run on Linux/Unix and Windows operating system. ntop provides a very easy to use a web access to navigate through ntop traffic information and get a dump of the network status.

DarkStat - Network traffic & bandwidth monitoring in openSUSE

Post date: October 16, 2008, 21:10 Category: Network Views: 4999 Comments
Tutorial quote: DarkStat is a simple Packet Sniffing Network Traffic/Bandwidth monitoring utility for Linux and UNIX. DarkStat presents simple webinterface with nice graphs and stats auto-refreshed. Darkstat uses a very low footprint and the memory, CPU usage and is used in pfSense, redWall opensource firewalls.
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