A quick tip for command line users: if you want to convert .png files to .pdf:

convert *.png filename.pdf

Simple! If you want to keep control of page sequence or specific files to convert:

convert page1.png page2.png page3.png filename.pdf

Needless to say, but I’ll say it anyways, the .pdf won’t be in vector graphics, so not scalable but that is because .png is not a vector graphics format.

For those who are vim fans, a quick tip on how to run a diff/merge  task:

Open the files with:

vimdiff file1 file2 file3   –> Vertical split is default

vimdiff -o file1 file2 file3  –> If you’d like horizontal split of files

To jump between files:

Ctrl-W w

To jump places where differences are found:

]c    –> to see next part of a change

[c   –> to go back to the start of a previous part of a change

Here is a simple and quick way for you to encrypt files in Linux:

gpg –output doc.gpg –encrypt –recipient [email protected] original_file.doc

Further explained:

• –output (or -o) is the name of the encrypted file
• –recipient (or -r) is the person who will be decrypting the file. If the file is for yourself only, use the email address of your GPG key.

To decrypt:

gpg --output output_file.doc --decrypt doc.gpg

I recently used this to encrypt a sensitive file before placing it on my Dropbox account. Nice safe way to place a private document in the cloud.

A quick tip to get the dust out of our blog 🙂

If you hear the fan of your computer going way up, most likely that was because some application or process is using too much CPU. Find out which one and terminate it by:

1. Open the terminal

2. Run “top”

3. Press “k” and the number on “pid” column of the process which appears on the top of the list.

The eco-system around Pidgin is fantastic, below is yet another cool plug-in tip for it.

Pidgin-Twitter plug-in works with Linux and Windows for you to get back into posting to and receiving notes from Twitter (also works well with Identi.ca too!). Steps to get it working:

1. download and install the plug-in the plug-in;
2. go to Pidgin menu under Tools > Plug-ins you’ll find Pidgin-Twitter to activate and configure;
3. place your username / password and define a couple of other options (such as show users’ avatars)
4. Add a buddy to your GTalk account called [email protected] and choose to display it even when it is offline.

You’re good to go! Open the chat window for the buddy you just created and instantly it’ll display your messages.

Migrating from a proprietary licensed mindset into open source can be perceived as a pretty challenging task. It is incredibly common for me to see that branding power often blinds people in a way that the functionalities of a software are disregarded in favor of the comforting sound of a brand name.

What does all that marketing blah blah means?

At my work, all new computers have open source software on it. The email client, office suite, browser, image editor, project management software and programming tools are all installed in the new employee’s computer from his/her day one.

D.O.A. (1950) movie

Found in the Internet Archive, D.O.A. of 1950 is a classic film noir movie.

Although I’m not a fan of old movies, this drama mystery was pretty worth it. The basic story is of a person who tries to investigate who murdered him. The story is pretty rich with very good moments of suspense and a nice character build-up. The victim who has received a deadly poison goes out to search for his own killer. During this process there are shootings, lots of detective-style work, romantic scenes and brave escapes.

Sharing with you my list of Linux and Open Source podcasts and vidcasts I subscribe to:

• FLOSS Weekly (podcast) – part of the Twit.tv world, excellent interviews with leaders of different FLOSS projects;
• Linux Outlaws (podcast) – this show is quite informal but has very nice comments on what’s new on the Linux and FLOSS world;
• Stack Overflow (podcast) – more geared towards programming and software development;
• The Linux Journal (vidcast) – short but very nice Linux tips;
• Category 5 (vidcast) – a lot of good information for those starting in the world of Linux with live Q&A session;
• The Source (vidcast) – just started following it and so far I’ve seen some very nice interviews with important community members of the open source world.

Any suggestions from our readers?

If you’re using Linux with Gnome, do a mouseover the music file and you’ll start hearing the song immediately.

You don’t even need to double-click to open the file in a media player, not even a mouse click is needed. Nice little hidden secrets of an awesome desktop file manager.

If you’re interested in Free Libre Open Source Software and would like some valuable reading material to become an expert, FLOSS Manuals is a great site.

You can find books about Blender, Inkscape, Firefox, OpenOffice, Audacity, WordPress, Linux Command Line, to name a few. Find the manual you want, read it on their site, download, or order a printed copy. Only the printed copy is not free.

Also cool is the ability to remix your book to get only certain chapters that you find interesting.