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Emacs is a very challenging editor to learn to use visual learners that are raised with Microsoft Word and other visual (read more or less over-engineered editors) so to help alleviate the keyboard navigation blues, a guy called Steven Chan has created a Emacs Visual Cheat Sheet, which is as the names mentions visual and provides an easy way to learn emacs and the most common keyboard shortcuts.

The cheat sheet includes navigation commands, the most common commands for Open/Save/Close, working with buffers, searching, and Copy/Cut/Paste edit functionality.

Download the Emacs Visual Cheat Sheet.

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Audacity (No 1 Linux Audio Editor)
Audacity is a digital audio editor and recording application. Audacity is free, open source and cross-platform, available for Windows, Mac OS X, BSD also. Audacity was created by Dominic Mazzoni while a graduate student at Carnegie Mellon University. Mazzoni now works at Google, but is still the main developer and maintainer of Audacity, with help from many others around the world.

As of 20 October 2009, it was the 6th most popular download from SourceForge.net, with 63 million downloads. Audacity won the SourceForge.net 2007 Community Choice Award for Best Project for Multimedia.

Sweep (No 2 Linux Audio Editor)
Sweep is a digital audio editor and live playback tool for Linux, BSD and compatible systems. It is able to handle many sound formats, including MP3, WAV and Vorbis. The most notable feature of Sweep is its stylus-like cursor tool called Scrubby. Sweep is included in most modern Linux distributions. Released under the GNU General Public License, Sweep is free software.

ReZound (No 3 Linux Audio Editor)

ReZound is an digital audio editor primarily for, but not limited to, the Linux operating system. Licensed under the GPL. ReZound is free software. Presently, ReZound’s focus is on editing audio files for permanent change as opposed to arranging and/or filtering existing audio files to produce a composite work. It can optionally load a variety of audio file formats being dependent upon several audio file libraries. ReZound implements a standard set of editing tools and digital filters (some these tools with useful twists on the usual theme). Additionally, it supports loading LADSPA plugins. The last ReZound version, 0.12.3beta, was released on January 13, 2007. The project seems to be stalled as of 2008-01-26.

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Any existing Ext3 filesystem can be migrated to Ext4 with an easy procedure which consists in running a couple of commands in read-only mode (described in the next section). This means that you can improve the performance, storage limits and features of your current filesystems without reformatting and/or reinstalling your OS and software environment. If you need the advantages of Ext4 on a production system, you can upgrade the filesystem. The procedure is safe and doesn’t risk your data (obviously, backup of critical data is recommended, even if you aren’t updating your filesystem . Ext4 will use the new data structures only on new data, the old structures will remain untouched and it will be possible to read/modify them when needed. This means, that, of course, that once you convert your filesystem to Ext4 you won’t be able to go back to Ext3 again (although there’s a possibility, described in the next section, of mounting a Ext3 filesystem with Ext4 without using the new disk format and you’ll be able to mount it with Ext3 again, but you lose many of the advantages of Ext4).

Migrate a ext3 filesystem to ext4
You need to use the tune2fs and fsck tools in the filesystem, and that filesystem needs to be unmounted. Run:

# tune2fs -O extents,uninit_bg,dir_index /dev/sda1

After running this command you must run fsck. If you don’t do it, Ext4 will NOT be able to mount your filesystem. This fsck run is needed to return the filesystem to a consistent state. It WILL tell you that it finds checksum errors in the group descriptors – it’s expected, and it’s exactly what it needs to be rebuilt to be able to mount it as Ext4, so don’t get surprised by them. Since each time it finds one of those errors it asks you what to do, always say YES. If you don’t want to be asked, add the “-p” parameter to the fsck command, it means “automatic repair”:

# fsck -pDf /dev/sda1

There’s another thing that must be mentioned. All your existing files will continue using the old indirect mapping to map all the blocks of data. The online defrag tool will be able to migrate each one of those files to a extent format (using a ioctl that tells the filesystem to rewrite the file with the extent format; you can use it safely while you’re using the filesystem normally)

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DOS text files traditionally have a carriage return and line feed character as newline character or symbol – mostly for historic reasons i think. Unix and Linux on the other hand have a line feed character as newline character in text files – and Macs have yet another “standard”.

From time to time I need to convert from one text file “standard” to another.

Red Hat-based Linux distributions are normally distributed with a small tool called dos2unix, which is able to do the conversion job very easy, but Debian-based Linux distributions like Debian itself and Ubuntu do not include the dos2unix tool by default.

The dos2unix tool i available in the Debian / Ubuntu package called tofrodos. To install the packages just type:

aptitude install tofrodos

Once you have the tofrodos package installed you are able to use the dos2unix command from the command line, like this:

dos2unix dosfile.txt

After running the command all the historic and crappy windows newlines are gone.

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Red Hat Enterprise Linux 5 has been released. Red Hat, one of the world’s leading providers of open source Linux solutions, today announced the availability of Red Hat Enterprise Linux 5. The new release introduces SELinux management tools, Xen virtualization, IPV6 support, and a number of less prominant new services and solutions. Read the full press release from Red Hat.

The first review of Red Hat Enterprise Linux 5.

Red Hat’s own product Red Hat Enterprise Linux 5 showcase site.

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This week Oracle stated that their own Linux version (read: fork) of Red Hat’s Enterprise Linux was more refined and better than its Red Hat competitor/flavour, but according to this review, Oracle’s Unbreakable Linux seems broken by default.

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