beets is a cross-platform command line music tagger and organizer which you can use to "get your music collection right once and for all".

It can improve your music collection metadata by using MusicBrainz, download cover art for all your albums, reorganize your music files, fix filenames and more.

Further more, beets is extensible through plugins which add extra functionality like  embedding or extracting album art from files, fetch lyrics for all your songs, clean up tags and and there's even a HTML5 web player (though it's very basic and can't do too much for now).

This post explains how to display Google Calendar on your Desktop using Conky and Gcalcli (a tool you can use to manage Google Calendar via the command line).

If you already have a Conky instance running and want to also display Google Calendar on your desktop using Conky, see this how-to on running multiple Conky instances.

YouTube keeps making changes to the website which breaks all YouTube download applications, including my favourite YouTube downloader called "youtube-dl". For this reason, we've backported the Maverick version for Ubuntu Karmic and Lucid users - and the updated version is available in the WebUpd8 PPA.

But before you install the latest youtube-dl, a little info on this amazing YouTube command line donwloader.

Here's a quick tip which many will find very handy. UNP is a small script which makes it very easy to extract almost any archive via command line. If you can't remember the command to extract tar.gz, rar and so on, you will love unp.

Fish is a user friendly command line shell. It features syntax highlighting, advanced tab completion features, discoverable help, a revised shell syntax and many other features.

Fish comes with a lot of features, but I find one feature truly amazing: tab completion for command line arguments, including explanations.

Example typing: "find -na", when pressing the TAB button completes it to "find name". Typing "find -a" and then pressing TAB will show all arguments that start with "-a" - and it also includes detailed explanations.

Here is a screenshot to understand better:

Vivek Gite @ Cyberciti has a really nice tip for the "history" command. Normally, running the command "history" in a terminal will give you an output which looks like this:

Showing the exact date next to each command would be incredibly useful, don't you think? Have a look: