21 Examples To Make Sure Unix / Linux Configuration Files Are Free From Syntax Errors

Posted on in Categories Howto, Linux, Sys admin, Tips, UNIX last updated June 24, 2017

Check for syntax errors on Linux or Unix
In Linux and UNIX system services are configured using various text files located in /etc/ or /usr/local/etc/ directory tree. A typical server system could have dozens of configuration files.You can check your configuration files for syntax errors without starting the server and validate all settings. In some cases, it is possible to to check the sanity of the specific data (such as keys) or directories (such as /var/lib/cache/). Text files are easier to manage remotely. You can use ssh and a text editor. If there is an error in configuration, the server may not start. It may result in a disaster. This post explains how to quickly find out a syntax error for popular servers and test configuration file for syntax errors.

CentOS Linux Project In Trouble

Posted on in Categories CentOS, GNU/Open source, Linux, Linux distribution, RedHat/Fedora Linux last updated July 30, 2009

CentOS is a community-supported, freely-available operating system based on Red Hat Enterprise Linux. Lance Davis created CentOS and now he goes absent without leave. In an open letter from his fellow CentOS developers:

You have long promised a statement of CentOS project funds; to this date this has not appeared. You hold sole control of the centos.org domain with no deputy; this is not proper. You have, it seems, sole ‘Founders’ rights in the IRC channels with no deputy ; this is not proper.

Visual Representations Of Linux File Systems

Posted on in Categories File system, Howto, kernel, Linux last updated June 16, 2009

This is an interesting visualization techniques for software analysis. From the article:

Despite being a very important part of any operating system, file systems tend to get little attention. Linux has three editions for Linux Device Drivers, another three for Understanding the Linux Kernel and two for Linux Kernel Development. The first is a detail analysis of one particular Linux Kernel tree and the second is a shorter one done over a large number of file systems from Linux Kernel 2.6.0 to 2.6.29. After that there is a small section that shows some aspects of the BSD family. After conclusions there is an appendix consisting of three things: the first one explains how the file systems for Linux were compiled, the second one shows timelines for the releases of Linux Kernel, FreeBSD, NetBSD and OpenBSD; the last is a detailed map of the external symbols of the kernel modules analyzed in the second section.

A Visual Expedition Inside the Linux File Systems

Security Through Obscurity: MAC Address Filtering ( Layer 2 Filtering )

Posted on in Categories data center, fedora linux, FreeBSD, Gentoo Linux, GNU/Open source, Hardware, Iptables, Linux, Networking, RedHat/Fedora Linux, Security, Ubuntu Linux, UNIX, Windows, windows vista, Wireless networking last updated February 17, 2009

MAC Filtering (layer 2 address filtering) refers to a security access control methodology whereby the 48-bit address assigned to each network card is used to determine access to the network. Iptables, pf, and IPFW can block a certain MAC address on a network, just like an IP. One can deny or allow from MAC address like 00:1e:2a:47:42:8d using open source firewalls. MAC address filtering is often used to secure LAN or wireless network / devices. Is this technique effective?

Video Contest: I am Linux

Posted on in Categories Linux, Linux desktop, Linux distribution, News, OS X, Windows, windows vista last updated December 21, 2008

The Linux Foundation is launching a video contest and you can win yourself a trip to Tokyo next year to participate in the Linux Foundation Japan Linux Symposium Oct, 2009.

If you’ve been alive and aware of mass media over the last twelve months, you’ve probably seen television commercials from Apple and Microsoft touting their operating system. From Apple’s ubiquitous “I’m a Mac” to Jerry Seinfeld to Microsoft’s “I’m a PC” retort, operating system commercials have been flooding the airways. Except one OS has been notably absent — Linux.


You can upload your contest video here.

School Teacher Accusing a Student And an Open Source Software Project of Breaking The Law

Posted on in Categories Linux, Linux desktop, News, Windows, windows vista last updated December 10, 2008

Wow.. a completely ignorant teacher. This clearly demonstrate problem faced by GNU/Linux in class room.

A teacher (from Austin, TX) came to students and confiscated the Linux Live CDs. Next, she wrote an angry email to HeliOS’s project founder, Ken Starks:

After confiscating the disks I called a confrence with the student and that is how I came to discover you and your organization. Mr. Starks, I am sure you strongly believe in what you are doing but I cannot either support your efforts or allow them to happen in my classroom. At this point, I am not sure what you are doing is legal. No software is free and spreading that misconception is harmful. These children look up to adults for guidance and discipline. I will research this as time allows and I want to assure you, if you are doing anything illegal, I will pursue charges as the law allows. Mr. Starks, I along with many others tried Linux during college and I assure you, the claims you make are grossly over-stated and hinge on falsehoods. I admire your attempts in getting computers in the hands of disadvantaged people but putting linux on these machines is holding our kids back.

This is a world where Windows runs on virtually every computer and putting on a carnival show for an operating system is not helping these children at all. I am sure if you contacted Microsoft, they would be more than happy to supply you with copies of an older verison of Windows and that way, your computers would actually be of service to those receiving them

Read on ken’s reply: Linux – Stop holding our kids back

Perhaps, some one need to educate the teacher and point out that Linux is being used by governments, private & public corporations, and millions of embedded home appliances worldwild are powered by Linux.

apt-p2p: How To Upgrade Ubuntu 8.10 Using BitTorrent [ Intrepid Ibex ]

Posted on in Categories GNU/Open source, Howto, Links, Linux, Linux desktop, Linux distribution, Ubuntu Linux last updated October 30, 2008

Today Ubuntu Linux 8.10 final will be released to all mirrors world wild. However, FTP/HTTP mirrors server may down due to heavy demands from users. You can now use BitTorrent to upgrade Ubuntu Linux to 8.10 from old 8.04 version. Help Ubuntu project to spread Linux to humanity.
In the past, the update servers would crash very quickly on a big release day, making it hard for people to get the latest update. With BitTorrent, however, this can be easily avoided.

Download TrueCrypt Open Source Full Disk Encryption Software

Posted on in Categories CentOS, Data recovery, Download of the day, Gentoo Linux, GNU/Open source, Hardware, Howto, Linux, Linux desktop, Linux laptop, OS X, RedHat/Fedora Linux, Save money with FOSS, Windows, windows vista last updated July 8, 2008

TrueCrypt version 6.0 has been released and available for download. It is free open-source hard disk encryption software for Windows Vista/XP, Mac OS X, and Linux system.