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Unix clones tutorials
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Using the GNU Privacy Guard |
| Post date: April 15, 2005, 19:04 Category: Software Views: 735 Comments: 0 |
Tutorial quote: Tonight we will investigate the gnupg utility (version 1.07). I will be running it on an OpenBSD 3.2 system but, as usual, any unix-like system should not display any significant differences. I will assume that GPG is already installed.
The GNU Privacy Guard can be regarded as a complete replacement for the popular PGP (Pretty Good Privacy) software. The difference between the two is that GnuPG does not have any licensing restrictions and it also runs on more platforms. They are both open source products. Although owned by a commercial entity, a freeware version of PGP is available (although only for Windows and Macintosh).
In a nutshell, what all this software does is allow two parties to communicate securely. This implies the following:
- the message has arrived at its destination unaltered
- the message can only be read by its intended recipient
- the authenticity of the sender has been verified by the recipient |
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Screen: an introduction and beginner's tutorial |
| Post date: April 15, 2005, 18:04 Category: Software Views: 800 Comments: 0 |
Tutorial quote: Most modern Unix-based operating systems (e.g. Linux, MacOS X, and BSD) come with a little console-mode utility called GNU Screen. It's a powerful tool in the hands of the console warrior, a veritable Swiss Army knife of text-mode human-computer interaction.
This utility, despite its considerable usefulness, goes unused by a great many people. Why is this? Few people even know it's there, and those that do rarely understand the problem it solves. In this article, I will explain what screen does for you, and provide a simple set of instructions for accomplishing basic tasks using screen. My audience is those that are skilled with the command line but who have little or no experience with screen itself. |
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Chkrootkit Portsentry Howto |
| Post date: April 15, 2005, 18:04 Category: Security Views: 1009 Comments: 0 |
Tutorial quote: This document describes how to install chkrootkit and portsentry. It should work (maybe with slight changes concerning paths etc.) on all *nix operating systems.
Chkrootkit "is a tool to locally check for signs of a rootkit" (from http://www.chkrootkit.org).
"The Sentry tools provide host-level security services for the Unix platform. PortSentry, Logcheck/LogSentry, and HostSentry protect against portscans, automate log file auditing, and detect suspicious login activity on a continuous basis" (from http://sourceforge.net/projects/sentrytools/).
This howto is meant as a practical guide. |
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Setting Up Samba 3.x |
| Post date: April 15, 2005, 18:04 Category: Network Views: 923 Comments: 0 |
| Tutorial quote: Recently I got the opportunity to setup a new lab for a small school. The server runs Linux and the workstations run WindowsXP. There are 3 levels of access on the workstations (admin, teacher, and student) and security on the workstations is based on Windows policies applied at logon. |
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The lost art of named pipes |
| Post date: April 15, 2005, 16:04 Category: System Views: 746 Comments: 0 |
| Tutorial quote: A "named pipe" -- also known as a FIFO (First In, First Out) or just fifo -- is an inter-process communication mechanism that makes use of the filesystem to allow two processes to communicate with each other. In particular, it allows one of these to open one end of the pipe as a reader, and the other to open it as a writer. Let's take a look at the FIFO and how you can use it. |
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Providing FTP Services with PureFTPd |
| Post date: April 15, 2005, 16:04 Category: Network Views: 741 Comments: 0 |
| Tutorial quote: If you work around computers for any length of time you'll probably run into an FTP server. FTP stands for File Transfer Protocol and FTP servers are used to do just that, transfer files. FTP has been around for a long time, much longer than P2P programs, or the World Wide Web, in its day it was the primary method of sharing files with others on the Internet, and it remains very popular even today. This tutorial will cover the installation and setup of an FTP server using PureFTPd. |
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How to Block Ads With Adzap |
| Post date: April 15, 2005, 16:04 Category: Network Views: 924 Comments: 0 |
| Tutorial quote: For some time at my workplace we've been running an ad-zapping service on our web proxy. This page documents how it works, how to use it yourself, how to join the mailing list for updates of the pattern file, and the weirdnesses of our local setup (which you need not duplicate yourself). |
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Using network transfer protocols |
| Post date: April 15, 2005, 13:04 Category: Network Views: 620 Comments: 0 |
Tutorial quote: Let's face it, most of us are in a rut when it comes to moving our files around. We learned how to use a simple FTP client years ago, and maybe even updated to a GUI FTP client when we were feeling particularly adventurous. There are actually a wealth of tools available for transferring files, and some of them perform automation functions that can easily assist your business in building site mirrors, synchronizing directory contents, and more.
Keep in mind that for many of the tools covered here, there's only really room to skim through their features. Some, such as wget and rsync, are full of useful capabilities for those brave enough to read their man pages and experiment. |
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Have a Bash With This Linux Shell |
| Post date: April 15, 2005, 00:04 Category: Programming Views: 980 Comments: 0 |
| Tutorial quote: Any Linux administrator who wishes to remain sane relies heavily on scripting to automate routine tasks, customize jobs, and build the plumbing that connects the different utilities that make a Linux system run smoothly. The Linux world is chock-full of scripting languages: Perl, Python, PHP, Scheme, Tcl, Tk, Ruby, Forth, Smalltalk, Eiffel, and doubtless many more. To get the column started, we'll look at shell scripting with Bash, and scripting with Python and Perl. |
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Get More Out of Your Pipe with Apache and mod_gzip |
| Post date: April 14, 2005, 08:04 Category: Network Views: 713 Comments: 0 |
Tutorial quote: Some Web sites seem like they are designed to annoy and alienate visitors. Teeny tiny fixed fonts, weirdo fixed page widths, ad servers on Mars, and the content won't load until the ads do, and all kinds of dynamic jiggery-pokery that does everything but quickly deliver a nice, readable page.
Webmasters who are serious about running high-performance Web servers, and who want pleased and delighted visitors, have a great tool in Apache 1.3's mod_gzip. mod_gzip compresses pages on the fly, reducing their size considerably. Depending on the types of files served, you'll see size reductions ranging from 20%- 80%, and a nice increase in server efficiency. Nothing is needed on the client side, except sane modern Web browsers like Mozilla, Firefox, Opera, Galeon, and Konqueror. Mozilla, Firefox, and Opera are nice cross-platform browsers with all kinds of neat features, so don't be afraid to standardize on one of them. |
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