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Linux Terminal: Check who uses all your memory with smem

Oct 202013

As system administrator, or simple user that uses Linux on its desktop sometime you notice that something it’s eating all the memory of your system.
As first thing be sure to understand how Linux manage memory, I’ve be called too many time by scared users that did a free and were unable to read its output properly, in short, don’t worry if the Linux Kernel it’s using your memory to cache file.

< rant on >

To my “beloved” users:

Be assured that the Kernel developers can do a better job than you (and me) in find a good algorithm to cache file and free that memory area when a process need it, so please don’t ask me to put in cron some job that run something like that :

echo 3 > /proc/sys/vm/drop_caches

After that you’ll have more free memory available on the system, true, but the system will have to re-read all the files from the disk, so in terms of performance this is usually a bad move.

< /rant >

But now let’s take a look at a nice small program that can help us in find which process/users are using, for real, the memory of our systems.

Linux Terminal: Seeing the unseen characters with cat!

Guides, Pills 1 Response »

Oct 122013

Sometimes a program or software don’t start for a syntax error, and if you check the files there is nothing wrong..apparently.
There are a lot of characters that usually are not printed if you use a normal text editor, but you can easily check if they are present with your terminal and the command cat.

As first thing let’s create a simple text file with these special characters, open a terminal and run the command:

printf 'testing\012\011\011testing\014\010\012more testing\012\011\000\013\000even more testing\012\011\011\011\012' > /tmp/testing.txt

Now if you open the file with an editor you’ll have different results.
A simple cat will show:

$ cat /tmp/testing.txt 
testing
		testing
 
more testing
 
        even more testing

Linux Games: Eyes: The Horror Game

Pills, Reviews No Responses »

Oct 072013

Article by Jem

When most people think of video games on a computer, they assume that all games must be played on a computer running Microsoft Windows. These people forget that there are other operating systems for people to play games on like Linux. This operating system is found to be quite capable with non-gaming tasks and now developers have started to turn their attention to this small, but growing section of customers who wish to play games also. With the new found attention that Linux is gaining, even Steam is starting to support Linux with increasing types of games starting to appear. This includes horror and scary games. One of the games which are making people scream at their monitors is Eyes: The Horror Game.

BitTorrent Sync: Automatically sync files on your Linux Devices

Guides, Reviews 1 Response »

Oct 042013

Have you finish your cloud space on Dropbox, Google Drive or one of the many cloud storage providers ? Or maybe you don’t trust them and you’d prefer a solution made with your computer/vps/Server ?

Good news, from some time there is a new solution available: BitTorrent Sync

BitTorrent Sync by BitTorrent, Inc is a proprietary peer-to-peer file synchronization tool available for Windows, Mac, Linux, Android, iOS and BSD. It can sync files between devices on a local network, or between remote devices over the Internet via secure, distributed P2P technology, so in short you can setup your own cloud storage and share your files among your devices.

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