Friday, December 28, 2012

Statistics on OSS

From time to time, the use of OSS needs justification. What better then information based on open source development model. This includes;

  1. Large number of contributors
  2. Frequency of updates (commits)
  3. Lines of codes
I found such info from Example for HTTP Server from Apache is at

Saturday, December 15, 2012

Upgrade Sony Tablet S to Android 4.0.3 rel5

Just received notice of an upgrade. Current Android is 4.0.3 rel 1.

Info on updates is at

Thursday, December 6, 2012

Speedtest via Digi results for Digi on SE Xperia X10i with Android 2.3.3

Subscribed to Digi unlimited
[1st round] on 6 Dec 2012
Download: 558kbps, Upload: 377kbps
Ping 99ms

[2nd round] on 6 Dec 2012

Download: 1658kbps, Upload: 372kbps
Ping 90ms


Tuesday, December 4, 2012

Centos Linux and 7z

Files with the extension of .7z indicates its a 7-zip compressed files in unicode format. To access files within the 7z, you will need to uncompress or extract the 7z file. By default, compression uses LZMA or Lempel–Ziv–Markov chain algorithm, which is an algorithm used to perform lossless data compression.

The program used to access 7z files;

  1. Windows: 7-zip
  2. Centos Linux: p7zip

Main differences of 7z and tar, is that 7z is meant to be more portable. This includes dropping of the user/group permission of files. I will demonstrate based on Centos 6.

A. Creating a 7z file
Step 1: Installing p7zip
yum install p7zip

Step 2: Compress files in directory named "examples" into the file myfiles.7z
7za a myfiles.7z

Step 3: List files within myfiles.7z
7za l myfiles.7z

Example output as below (note - no user/group info)

7-Zip (A) [64] 9.20  Copyright (c) 1999-2010 Igor Pavlov  2010-11-18
p7zip Version 9.20 (locale=en_US.UTF-8,Utf16=on,HugeFiles=on,4 CPUs)

Listing archive: scripts.7z

Path = scripts.7z
Type = 7z
Method = LZMA
Solid = +
Blocks = 1
Physical Size = 4319
Headers Size = 365

   Date      Time    Attr         Size   Compressed  Name
------------------- ----- ------------ ------------  ------------------------
2012-12-04 09:17:15 ....A          179         3954  examples/svn-auth-users
2012-12-04 09:17:15 ....A           35               examples/
2012-12-04 09:17:15 ....A         1004               examples/
2012-12-04 09:17:15 D....            0            0  examples 
------------------- ----- ------------ ------------  ------------------------
                                  1218         3954  3 files, 1 folders

Optional steps;
Verify 7z file
7za t myfiles.7z

B. Extracting a 7z file

Step 1: Extract to current directory
7za e myfiles.7z

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