Today I test a simple script that uses the OpenGL ARB "Architecture Review Board".
The script is very simple and can be found on my graphic-3d.blogspot.com.
I make this with Python 2.6.4 , pyopengl module.
tutorials, tips, tricks, commands, programming, linux, windows, database, sql, python, programming language, Fedora, drawing, painting, tutorial, tutorials
Monday, May 21, 2012
Sunday, April 1, 2012
Fedora online defragmenter for ext4 filesystem
The tool is e4defrag.
The man page tells us: reduces fragmentation of extent based file.
The file targeted by e4defrag is created on ext4 filesystem made with "-O extent" option (see mke2fs(8)). The targeted file gets more contiguous blocks and improves the file access speed.
Let's try this tool.
You can try under root account this:
The final result on my account is :
Also, you have to run e4defrag with the -test parameter for now, since it isn't a fully tested version.
The man page tells us: reduces fragmentation of extent based file.
The file targeted by e4defrag is created on ext4 filesystem made with "-O extent" option (see mke2fs(8)). The targeted file gets more contiguous blocks and improves the file access speed.
Let's try this tool.
You can try under root account this:
# e4defrag -test -cv /home/your_user/
The final result on my account is :
Total/best extents 170276/165520
Fragmentation ratio 0.03%
Fragmentation score 0.24
[0-30 no problem: 31-55 a little bit fragmented: 55- needs defrag]
Also, you have to run e4defrag with the -test parameter for now, since it isn't a fully tested version.
Monday, February 27, 2012
The LightScribe - without labels and handwriting.
LightScribe is an innovative technology that uses a special disc drive, special media, and label-making software to burn labels directly onto CDs and DVDs.
Download the packages from here.
Use the root account and install this packages :
See the files:
Insert the special media in the special disc drive with the face down.
This is a way to not use labels and handwriting.
Download the packages from here.
Use the root account and install this packages :
# rpm -ivh lightscribe-1.18.24.1-linux-2.6-intel.rpm
Preparing... ########################################### [100%]
1:lightscribe ########################################### [100%]
# rpm -ivh lightscribeApplications-1.18.15.1-linux-2.6-intel.rpm
Preparing... ########################################### [100%]
1:lightscribeApplicationswarning: group admin does not exist - using root%)
warning: group admin does not exist - using root
########################################### [100%]
The path application is /opt/SimpleLabeler/See the files:
$ ll
total 332
drwxr-xr-x. 4 root wheel 4096 Feb 27 14:10 content
-rwxr-xr-x. 1 root wheel 2980 May 19 2010 launchBrowser.sh
drwxr-xr-x. 3 root wheel 4096 Feb 27 14:10 plugins
-rwxr-xr-x. 1 root wheel 43 May 19 2010 qt.conf
-rw-r--r--. 1 root root 16 May 19 2010 qttr.qm
-rwsr-xr-x. 1 root wheel 314088 May 19 2010 SimpleLabeler
-rw-r--r--. 1 root root 16 May 19 2010 simplelabelertr.qm
Run the SimpleLabeler, and you see this :Insert the special media in the special disc drive with the face down.
This is a way to not use labels and handwriting.
Saturday, February 18, 2012
G'MIC plug-in for GIMP.
GIMP is an acronym for GNU Image Manipulation Program and it has many capabilities.
One best feature is the plugins system. Plugins may be stored in different locations depending upon your distribution.
The author of G'MIC plug-in tell us: The G'MIC plug-in for GIMP proposes a set of various filters to apply on your images, including artistic effects, image denoising, and enhancement algorithms, 3D renderers, etc.. It is a quite large plug-in, integrating a lot of different effects.
You can download the G'MIC plug-in from here.
Unzip the file and go to the folder where is the gmic_gimp file.
Use this command to copy the file in the plug-ins folder.
The G'MIC will work just if you have opened an image.
You can find it on menu: Filters-> G'MIC... Also, the G'MIC plug-in has available 284 filters.
One best feature is the plugins system. Plugins may be stored in different locations depending upon your distribution.
The author of G'MIC plug-in tell us: The G'MIC plug-in for GIMP proposes a set of various filters to apply on your images, including artistic effects, image denoising, and enhancement algorithms, 3D renderers, etc.. It is a quite large plug-in, integrating a lot of different effects.
You can download the G'MIC plug-in from here.
Unzip the file and go to the folder where is the gmic_gimp file.
Use this command to copy the file in the plug-ins folder.
$ cp gmic_gimp ~/.gimp-2.6/plug-ins/
Once you have installed the plugin just restart the GIMP.The G'MIC will work just if you have opened an image.
You can find it on menu: Filters-> G'MIC... Also, the G'MIC plug-in has available 284 filters.
Saturday, November 26, 2011
Protect your root account.
I will present a solution to protect the root account, quite funny but still elegant.
You can read about the command trap using: man trap.
What is this command?
when the specified event will occur will execute the command specified.
In this case, it will receive signal respectively will execute one command - exit
The source code.
Now protect the file against unauthorized changes:
You can read about the command trap using: man trap.
What is this command?
when the specified event will occur will execute the command specified.
In this case, it will receive signal respectively will execute one command - exit
The source code.
protect()
{
echo "What is the secret ?"
trap protect 2 20
read -s resp
if [ "$resp" != "asd" ]; then
echo "Error!"
exit
fi
}
protect
The result will be leaving the root account if you do not answer the question correctly.Now protect the file against unauthorized changes:
# chmod 700 /root/.bashrc
You can create using the example above, different ways to execute various commands.
Monday, September 26, 2011
Android ARM Assembly by Vikram Aggarwal
Today I read an interesting article about Android.
The article is written by the developers Vikram Aggarwal, a software engineer at Google.
This article - tutorial consists of a series on learning ARM assembly on Android.
Its subject is "...calling Assembly code from Android applications".
The tutorial contains the necessary source code and details for the reader to understand how it works.
For those who have never used Gas (GNU Assembler), this article is of interest much.
I wonder if there is anyone interested in the Fedora community to write Android applications.
This article can be read here.
The article is written by the developers Vikram Aggarwal, a software engineer at Google.
This article - tutorial consists of a series on learning ARM assembly on Android.
Its subject is "...calling Assembly code from Android applications".
The tutorial contains the necessary source code and details for the reader to understand how it works.
For those who have never used Gas (GNU Assembler), this article is of interest much.
I wonder if there is anyone interested in the Fedora community to write Android applications.
This article can be read here.
Saturday, September 24, 2011
Creating folders and documents with gdata module
Today I played with gdata python module.
The problem that I solved it:
creating folders and documents in your Gmail account.
First, you need to install the gdata module.
In fedora I used:
This is because there are many types of documents
The problem that I solved it:
creating folders and documents in your Gmail account.
First, you need to install the gdata module.
In fedora I used:
yum install python-gdata.noarch
Here are the first lines of source code that creates a folder named test-fedoraPython 2.7.1 (r271:86832, Apr 12 2011, 16:16:18)
[GCC 4.6.0 20110331 (Red Hat 4.6.0-2)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import gdata.docs.service
>>> my=gdata.docs.service.DocsService()
>>> my.ClientLogin('your-account@gmail.com','your-password')
>>> my.CreateFolder('test-fedora')
I tried to automate the process of creating folders and I used a list and instruction for>>> folders=['aaa','bbb','ccc']
>>> for f in folders:
... my.CreateFolder(f)
...
To create a document to write more lines of code.This is because there are many types of documents
>>> new_entry = gdata.GDataEntry()
>>> new_entry.title = gdata.atom.Title(text='fedora-test')
>>> category = my._MakeKindCategory(gdata.docs.service.DOCUMENT_LABEL)
>>> new_entry.category.append(category)
>>> created_entry = my.Post(new_entry, '/feeds/documents/private/full')
Here's a simple solution to avoid loss of mail password.>>> import getpass
>>> username = raw_input('Please enter your username: ')
Please enter your username: user1
>>> password = getpass.getpass()
Password:
>>> print username
user1
>>> print password
pass1
I hope you will use this
Thursday, September 15, 2011
The list of linux tutorials ...
The last time I wrote small tutorial for free-tutorials.org site.
These tutorials have covered several areas.
Here are targeting Linux.
The indication of a denial of service (DoS) attack...
How to display memory in real time on Linux system...
Change settings and passwords in Windows using Lin...
How to change bash custom prompt ?
How to use the import command to take screenshots?
Linux commands : "find" and the option "empty"
Create html file with bash script.
Simple bash script to create folders, files and im...
Using wget tool
error: dd: opening `/dev/sdb1': Permission denied...
error: 'memset' was not declared in this scope
Installing and configuring the Eclipse IDE - Googl...
How to set up an external webrowser on Eclipse IDE
Fedora - Install Skype
Modifying shortcuts keys on Bluefish 1.0.7
Fedora - How we can get movies from youtube.
Fedora 12 - How can we run one script when system ...
Linux Text-To-Speech Tutorial
Geany and regular expressions.
Yumex on Fedora
Assign keys on Linux.
I will try to write more tutorials about Linux...
These tutorials have covered several areas.
Here are targeting Linux.
The indication of a denial of service (DoS) attack...
How to display memory in real time on Linux system...
Change settings and passwords in Windows using Lin...
How to change bash custom prompt ?
How to use the import command to take screenshots?
Linux commands : "find" and the option "empty"
Create html file with bash script.
Simple bash script to create folders, files and im...
Using wget tool
error: dd: opening `/dev/sdb1': Permission denied...
error: 'memset' was not declared in this scope
Installing and configuring the Eclipse IDE - Googl...
How to set up an external webrowser on Eclipse IDE
Fedora - Install Skype
Modifying shortcuts keys on Bluefish 1.0.7
Fedora - How we can get movies from youtube.
Fedora 12 - How can we run one script when system ...
Linux Text-To-Speech Tutorial
Geany and regular expressions.
Yumex on Fedora
Assign keys on Linux.
I will try to write more tutorials about Linux...
Saturday, September 10, 2011
Fedora 15 : Extracting rar files
The unrar package can be installed from here.
The unRAR utility is a freeware program, distributed with source code and developed for extracting, testing and viewing the contents of archives created with the RAR archiver version 1.50 and above.
The unRAR utility is a freeware program, distributed with source code and developed for extracting, testing and viewing the contents of archives created with the RAR archiver version 1.50 and above.
unrar-3.9.9-1.fc15.x86_64.rpm
unrar-3.9.9-1.fc15.i686.rpm
unrar-3.9.9-1.src.rpm
unrar.spec
$ unrar
UNRAR 3.92 freeware Copyright (c) 1993-2010 Alexander Roshal
Usage: unrar - -
<@listfiles...>
e Extract files to current directory
l[t,b] List archive [technical, bare]
p Print file to stdout
t Test archive files
v[t,b] Verbosely list archive [technical,bare]
x Extract files with full path
- Stop switches scanning
ad Append archive name to destination path
ai Ignore file attributes
ap Set path inside archive
c- Disable comments show
cfg- Disable read configuration
cl Convert names to lower case
cu Convert names to upper case
dh Open shared files
ep Exclude paths from names
ep3 Expand paths to full including the drive letter
f Freshen files
id[c,d,p,q] Disable messages
ierr Send all messages to stderr
inul Disable all messages
kb Keep broken extracted files
n Include only specified file
n@ Read file names to include from stdin
n@ Include files listed in specified list file
o[+|-] Set the overwrite mode
or Rename files automatically
ow Save or restore file owner and group
p[password] Set password
p- Do not query password
r Recurse subdirectories
sl Process files with size less than specified
sm Process files with size more than specified
ta Process files modified after in YYYYMMDDHHMMSS format
tb Process files modified before in YYYYMMDDHHMMSS format
tn
Works well.
Thursday, June 16, 2011
Firefox sync - sinking ?
Today I tried to use Firefox Sync.
I do not remember if I had a user account, but I tried to make a password reset.
I do not know if the same thing happens on Windows, but on Fedora, I received a strange thing output.
I assumed that it is a cookie, but it is not normal.
Maybe someone can tell what it is ...
Here's the picture with this strange number:
I do not remember if I had a user account, but I tried to make a password reset.
I do not know if the same thing happens on Windows, but on Fedora, I received a strange thing output.
I assumed that it is a cookie, but it is not normal.
Maybe someone can tell what it is ...
Here's the picture with this strange number:
Friday, June 3, 2011
The myth of drop_caches
I will try to clarify the myth about drop_caches.
This along with other settings can be made in the folder:
First, the files in this directory can be used to tune the operation
of the virtual memory (VM) subsystem of the Linux kernel and also to
write out of dirty data to disk.
About drop_caches we can say that is only one of the options and not only make
causes the kernel to drop clean caches, and entries inodes from memory,
the result causing that memory to become free.
We have three basic options :
What happens then?
The answer is also simple and clear.
If you drop the cache than the CPU load goes up. This happens because the cache is gone.
Also, available RAM goes up because the cache is empty.
Logical, the performance will suffer because you are not taking advantage of the cache.
Then over time, the caches will fill and this is a good thing if you don't instruct Linux to drop the caches.
In reality, dropping caches has a little positive effect on performance, but in fact, it tends to have a negative effect in long-term.
I hope I have correctly understood and explained, so if you think it is not, I wait for your feedback.
This along with other settings can be made in the folder:
/proc/sys/vm/
First, the files in this directory can be used to tune the operation
of the virtual memory (VM) subsystem of the Linux kernel and also to
write out of dirty data to disk.
About drop_caches we can say that is only one of the options and not only make
causes the kernel to drop clean caches, and entries inodes from memory,
the result causing that memory to become free.
We have three basic options :
- to free pagecache: echo 1 > /proc/sys/vm/drop_caches
- to free dentries and inodes: echo 2 > /proc/sys/vm/drop_caches
- to free pagecache, dentries and inodes: echo 3 > /proc/sys/vm/drop_caches
What happens then?
The answer is also simple and clear.
If you drop the cache than the CPU load goes up. This happens because the cache is gone.
Also, available RAM goes up because the cache is empty.
Logical, the performance will suffer because you are not taking advantage of the cache.
Then over time, the caches will fill and this is a good thing if you don't instruct Linux to drop the caches.
In reality, dropping caches has a little positive effect on performance, but in fact, it tends to have a negative effect in long-term.
I hope I have correctly understood and explained, so if you think it is not, I wait for your feedback.
Fighting Blender, NVIDIA and GNOME ...
Today I spent some time with Blender, NVIDIA and GNOME ...
Since I did pre-update and put Fedora 15, the system worked well until today.
Today I tried to relax a bit with Blender 3D, but ...
Then I tried to see what glxinfo says.
Then I waited ... and waited ... I fixed up with a simple line of code:
Now I have the old gnome, slightly improved but it works flawlessly with Blender 3D...
Since I did pre-update and put Fedora 15, the system worked well until today.
Today I tried to relax a bit with Blender 3D, but ...
[free-tutorials@user ~]$blender
Info: Config directory with "startup.blend" file not found.
Segmentation fault (core dumped)
How to prevent uploading that file? Simply using:[free-tutorials@user ~]$blender --factory-startup
Segmentation fault (core dumped)
Obviously, I should try to debug:[free-tutorials@user ~]$blender --factory-startup -d
Blender 2.57 (sub 0)
Build: 2011-04-27 16:56:56 Linux:32bit Release
argv[0] = blender
argv[1] = --factory-startup
argv[2] = -d
read file
Version 256 sub 6 svn r36063
ordered
OBCube
OBLamp
OBCamera
Segmentation fault (core dumped)
Simply don't want, it's something related to graphics card ...[free-tutorials@user ~]$blender --factory-startup -d -noglsl
Blender 2.57 (sub 0)
Build: 2011-04-27 16:56:56 Linux:32bit Release
argv[0] = blender
argv[1] = --factory-startup
argv[2] = -d
argv[3] = -noglsl
read file
Version 256 sub 6 svn r36063
ordered
OBCube
OBLamp
OBCamera
Segmentation fault (core dumped)
So the problem is not related to GLSL.Then I tried to see what glxinfo says.
[free-tutorials@user ~]$glxinfo | grep Error
Error: glXCreateContext failed
I found this problem and I added to xorg.conf the following lines of code.Section "Files"
ModulePath "/usr/lib/xorg/modules/extensions/nvidia"
ModulePath "/usr/lib/xorg/modules/drivers"
ModulePath "/usr/lib/xorg/modules"
EndSection
I must admit that after restarting the computer, greeted me with the gnome interface and unprecedented special effects.Then I waited ... and waited ... I fixed up with a simple line of code:
$ gsettings set org.gnome.desktop.session session-name 'gnome-fallback'
... written in Xfce terminal, because in gnome I have not succeeded.Now I have the old gnome, slightly improved but it works flawlessly with Blender 3D...
Thursday, April 21, 2011
News: "A tour of Eclipse Helios" by IBM
It's a pretty good and complete information about Helios ...
Article begins:
The best part for Linux users is Linux tools.
As Andrew Overholt says in the same article:
Article begins:
Helios is the simultaneous release of 39 Eclipse projects. In terms of statistics, the Helios release includes 33 million lines of code developed by about 500 Eclipse.org committers from 44 companies...You can read here and you will be impressed by the new Helios.
The best part for Linux users is Linux tools.
As Andrew Overholt says in the same article:
"The Linux Tools project also aims to increase the amount of Eclipse technology available in Linux distributions. We are working towards this goal by providing a build harness of the Eclipse SDK that is easy to consume for Linux distributions and already have a number of distribution consumers."I have not yet found the negative aspects from the Helios ...
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