Advanced File Recovery
So, a few weeks ago, someone made the mistake of upgrading a computer
to Windows Vista from Windows XP. Besides the 8-hour upgrade process
headache (what was it doing?), it also left the machine unusable.
This person ended up reinstalling Windows XP and also installing
Ubuntu. After the whole process was over, this person claimed to have
lost important files. Excellent :-)
Since the partitions were completely destroyed and the OS reinstalled,
file system level access software would not be helpful. So, I dug
deep, and came up big. foremost. This GPL software seems to have
been written by the US military, and as such, is in the Public Domain
by default. It is now GPL software, and you can use it freely.
I read up on the docs, and here's how I got almost all the files back:
* Boot Ubuntu Live CD (never recover files from the HDD-installed system)
* Add extra software repositories to apt
$ sudo sed -i "s/main restricted$/main restricted universe multiverse/g" /etc/apt/sources.list
* Install the application 'foremost'
$ sudo aptitude install foremost
* Create a recovery directory (put this on USB, instead, if you have one)
$ sudo mkdir /root/recovery
$ sudo foremost -v -i /dev/hda -o /root/recovery
* Maybe you just want all those JPG files you lost and nothing else?
$ sudo foremost -v -i /dev/hda -o /root/recovery -t jpg
Finally, copy your files somewhere safe. If you don't have enough room
in the live system, you could mount a remote partition over NFS, SSH,
Some of you may be asking yourself what to do if foremost does not support the file types you lost. Maybe you lost some precious OGG files? No worries! Why don't you give 'magicrescue' a try? magicrescue allows you to define the proper "magic bytes" that define the file type. Basically, it's what the 'file' command would check against. You can see all magic definitions in /usr/share/file/magic. You can define your own and use them as input when you run magicrescue. The possibilities are endless.
So, if you need to get your data back desperately, these are
great options for you! Keep on hacking :-)
Practical Task Scheduling Deployment
July 20, 2016 12:00 pm CDT
One of the best things about the UNIX environment (aside from being stable and efficient) is the vast array of software tools available to help you do your job. Traditionally, a UNIX tool does only one thing, but does that one thing very well. For example, grep is very easy to use and can search vast amounts of data quickly. The find tool can find a particular file or files based on all kinds of criteria. It's pretty easy to string these tools together to build even more powerful tools, such as a tool that finds all of the .log files in the /home directory and searches each one for a particular entry. This erector-set mentality allows UNIX system administrators to seem to always have the right tool for the job.
Cron traditionally has been considered another such a tool for job scheduling, but is it enough? This webinar considers that very question. The first part builds on a previous Geek Guide, Beyond Cron, and briefly describes how to know when it might be time to consider upgrading your job scheduling infrastructure. The second part presents an actual planning and implementation framework.
Join Linux Journal's Mike Diehl and Pat Cameron of Help Systems.
Free to Linux Journal readers.Register Now!
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With all the industry talk about the benefits of Linux on Power and all the performance advantages offered by its open architecture, you may be considering a move in that direction. If you are thinking about analytics, big data and cloud computing, you would be right to evaluate Power. The idea of using commodity x86 hardware and replacing it every three years is an outdated cost model. It doesn’t consider the total cost of ownership, and it doesn’t consider the advantage of real processing power, high-availability and multithreading like a demon.
This ebook takes a look at some of the practical applications of the Linux on Power platform and ways you might bring all the performance power of this open architecture to bear for your organization. There are no smoke and mirrors here—just hard, cold, empirical evidence provided by independent sources. I also consider some innovative ways Linux on Power will be used in the future.Get the Guide