Latest Blog Posts for HVTA [cnttbachkhoa]

• Using Bitcoin is not eliminating fees — unless exchanges are no longer required
  on Jun 3, 2014 in Bitcoin bitcoin bitstamp coinbase exchange
  Disclaimer: I’m not expert/investor in Bitcoin. I see Bitcoin as a great opportunity and great replacement for traditional money. Want to know more about Bitcoin? Pay this a visit: http://www.reddit.com/r/bitcoin Recently more and more people t...
• How to use Macports version of gcc
  on Mar 1, 2014 in Mac
  OSX Mavericks only support gcc version 4.2.1. Macports, however supports gcc from 4.2 to 4.9. However, when you install gcc through Macports, your new version will not be enabled automatically. Here is a little trick: sudo port select --list gcc Avai...
• How to install Oracle Database 12c on RedHat Enterprise Linux 6
  on Jan 23, 2014 in Linux database headless oracle virtual display X11 forwarding
  IMHO, installing Oracle Database is not straight forward. There are lots of prerequisites packages and configurations that need to be installed and configured before you can actually install Oracle Database. Especially if you have a headless server t...
• How to solve “Too many authentication failures for…” problem
  on Nov 8, 2013 in Linux authentication id_rsa private key public key ssh
  Recently I am having trouble connecting to my home server from my laptop. Every time I connect, it said: Received disconnect from my_ip: 2: Too many authentication failures for my_username The strange thing is, connect from any other machine did not...
• Extract pages from PDF in Linux
  on May 2, 2013 in Linux extract pdf
  I am not usually have to extract pages from a pdf file, but when I do, I used Adobe(R) Acrobat 7.0 that resides on my old Windows XP machine (believe me, it’s still work at this time). Today one friend asked me to extract a page from his pdf fi...
• How to install rtorrent and rutorrent
  on Feb 3, 2013 in Linux rtorrent rutorrent torrent utorrent
  In order for rutorrent to work, rtorrent must be compiled with xmlrpc-c support. Here is the full instruction. 1. First, check to make sure the following libraries are installed on your system. At any step below, if you cannot run ./configure script...
• How to disable comment box from Facebook like widget
  on Jun 1, 2012 in CSS Facebook Programming facebook like
  It have been a long time since the last time I used Facebook like widget on my blog. At that time, I feel that Facebook scripts take a lot of time to load, hence slowdown my site and affect its performance. Today, I changed my mind and add it back. W...
• How to find all files of a particular size in a particular directory
  on May 21, 2012 in Linux find size
  Last weekend, I worked on a Linux malware cleaning project. After 30 minutes of finding, I found 2 suspected scripts that are not included in Drupal by default. I soon realized that there are many of them, and I have a very limit access to his websit...
• How to generate SSH public key from private key
  on Apr 20, 2012 in Linux keygen ssh
  Normally you will generate and store a pair of SSH public and private key. But do you know you can generate public key from private key with ease? Here is the trick: 1. For OpenSSH key: Open terminal and type: ssh-keygen -y 2. For PuTTY key: Open Put...
• How to format bytes to kilobytes, megabytes, gigabytes in PHP
  on Apr 11, 2012 in PHP Programming bytes kilobytes megabytes php
  This is the best function I found on StackOverflow: function formatBytes($bytes, $precision = 2) { $units = array('B', 'KB', 'MB', 'GB', 'TB'); $bytes = max($bytes, 0); $pow = floor(($bytes ? log($bytes) : 0) / log(1024)); $pow = min($pow, count($uni...

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