Paul Labis: This is a personal blog where everyone can read my experiences, ideas and thoughts about programming, latest gadgets and other information technology related topics, lifestyle and many other stuff I would like to share to the public.

by Paul Labis

0 Comments »

Encrypt and decrypt files in Ubuntu with ccrypt

ccrypt is a utility for encrypting and decrypting files and streams. It was based on Rijndael cipher, which was chosen candidate by U.S. government's for Advance Encryption Standard. This cipher is believed to provide a very strong security.


1. Install CCrypt from repo


sudo apt-get install ccrypt


2. To encrypt a file, use one of the following command,


ccrypt -e file_name or ccencrypt file_name


3. It will prompt you for Encryption Phrase aka Password, enter it. for example,


ccrypt -e sample.text 
Enter encryption key: your_key 
Enter encryption key: (repeat) your_key 


Note: Don't forget the encryption phrase, there is no way to get back the original file without it.

Read more »

by Paul Labis

0 Comments »

, ,

How to Backup and Restore PostgreSQL Database

There is an easy way to create backup file and restore your current PostgreSQL database using the Linux terminal. I am not sure though if this is the easiest way.

As of the moment I am writing this article, I used the following command to backup and restore my database. 

Using pg_dump and psql will make your life easier. Below are the terminal command I use to backup and restore my database.
  • Backup : pg_dump -U {user_name} {database_name} -f {backup_file_name}
  • Restore : psql -U {user_name} -d {database_name} -f {backup_file_name}
If you are getting an error:

Read more »

by Paul Labis

0 Comments »

, ,

Recover Ubuntu Grub2 After Windows Installation

A month ago I decided to dual-boot my laptop with windows 7 and Ubuntu 10.04 version as my main operating system. So I first installed Ubuntu 10.04 then Windows 7 afterwards. After installing Windows 7, ubuntu distribution isn't accessible. I am not sure but I think Windows installation might have wiped out Ubuntu grub.

To be able to recover Grub2 menu along with the option to select either which operating system you want to use, I did the following recovery steps below.
  1. Boot from Ubuntu Live CD - any Ubuntu distribution is okay to use for as long as you get access to linux terminal or bash shell.

Read more »

by Paul Labis

1 Comment »

,

Install NVIDIA driver manually for Asus K43 SV with Ubuntu Lucid 10.04

I just bought a new laptop Asus K43 SV and installed Ubuntu Lucid 10.04 LTS stable release. It has an i5 2nd generation processor with 4Gb of memory and 1 Gb of VRam. So far, I think this is the most affordable laptop I can look for in Philippine market offered free delivery through LBC by www.pccorner.com or www.laptopking.com from your online purchase.
Some of you might have difficulties in installing NVIDIA driver on your new bought Asus K43 SV laptop. I started researching online and found that there is a default yet not installed NVIDIA driver on synaptics. However, I had been screwing my desktop and as a result, I had to reformat my laptop again and again. I always backed-up my xorg.conf file but had difficulties on restoring it. Anyway, thats the end of story and in this article, I'm gonna share how to easily install NVIDIA driver manually on your k43SV. 

Read more »

by Paul Labis

0 Comments »

, ,

Commons Email - Examples

I found another good apache tool for sending emails.
Its easy to use and has good documentation.
Below is an example of an easy way to sending an email.
It is explained properly on apache user guide page which is embedded on the bottom part of this article.


import org.apache.commons.mail.*;
...

// Create the attachment
EmailAttachment attachment = new EmailAttachment();
attachment.setPath("mypictures/john.jpg");
attachment.setDisposition(EmailAttachment.ATTACHMENT);
attachment.setDescription("Picture of John");
attachment.setName("John");

// Create the email message
MultiPartEmail email = new MultiPartEmail();
email.setHostName("mail.myserver.com");
email.addTo("jdoe@somewhere.org", "John Doe");
email.setFrom("me@apache.org", "Me");
email.setSubject("The picture");
email.setMsg("Here is the picture you wanted");

// add the attachment
email.attach(attachment);

// send the email
email.send();

« Older Entries