VDI images of pre-installed “Open Source” Operating System distros. Pre-installed virtualbox images ready for you to explore and play with.
Open terminal.
Type echo PS1 to get current prompt line.
Type PS1=’something’ there something is
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Note: Based on some feedback I should clarify that this does not cover C99 syntax
Even though the C programming language has been around since the late 1960’s, many programmers still have trouble understanding how C declarations are formed. This is not unsurprising due to the complexity that can arise when mixing pointer, array and function-pointer declarations.
In this posting we shall look at some complex declarations to try and understand them by considering how they are formed. The intent is not so you can go off and write wonderfully complex declarations, but more hopefully you may actually be able to understand someone else’s code. Finally we shall look at how most complex declarations can be easily simplified.
Here I’m going to focus on object declarations/definitions rather than functions. Also, in this posting I’m not going to examine structure, union or enumeration specifies. They’ll keep for another day.
The upcoming C++ standard (C++0x) will support multithreading and concurrency both as an inherent part of the memory model, and as part of the C++ Standard Library. “Multithreading and Concurrency” (Anthony Williams):
Also Herb Sutter is a leading authority on software development. He is the best selling author of several books including Exceptional C++ and C++ Coding Standards, as well as hundreds of technical papers and articles, including “The Free Lunch Is Over” which coined the term “concurrency revolution.”
Effective Concurrency: Prefer Futures to Baked-In “Async APIs”
Many people don’t think of their command prompt as a particularly useful thing, or even pay it much attention. To me, this is a bit of a shame, as a useful prompt can change the way you use the command line. Well I’ve scoured the Interwebs looking for the best, most useful, or sometimes most amusing bash prompts. Here, in no particular order, are the ones I’d be most likely to use on my computers.
Starting in Ubuntu 8.04, ubiquity (the ubuntu system installer) allows the user to install Ubuntu while preserving the /home directory. This allows you to reset your computer to default but to keep your personal files and configuration files. The point of ubiquity-preserve-home is that it’s supposed to work smoothly behind the scenes using Ubuntu’s Installer.
If you choose not to format the partition assigned to “/”, then everything on that partition that would cause problems for an Ubuntu installation will be removed (e.g. the contents of /boot, /etc, /lib, /usr, etc.), but /home and other unknown directories that might contain data will be preserved. Doing this does not require an explicit action by the user, other than choosing manual partitioning and *not* formatting the partition assigned to “/”. This may be used as a last resort to restore Ubuntu to default at the point of installation but will preserve the /home directory.
We want Linux newbies to restore their new toy, but also help the Linux advanced user make potentially dangerous operations to the MBR in a safe way. Super Grub Disk is also a teaching tool to help you learn more about bootloaders and the booting process. After all, booting is the most important thing your computer does — without the boot process, you would not have an operating system to use!
A super simple way to convert almost any video to MP4, Ogg Theora, or a specific phone or iPod.
Miro Video Converter can convert virtually any video file to MP4, Theora, or MP3 (the audio only).
100% Free and open-source.
