Knowledge Sharing » Operating Systems

Extract zip, tar.gz, tar.bz2

Dagu — Mon, 01 Jun 2009 13:11:06 +0000

There are so many ways to extract zip or tar.gz or tar.bz2. You can use GUI or command line. In this tutorial, I would like to show you how to extract compressed files using command line.

Extract zip file:

unzip file_name.zip

Extract tar.gz file:

tar -xzf file_name.tar.gz

tar -xvzf file_name.tar.gz

Extract tar.bz2 file:

tar -xjf file_name.tar.bz2

tar -xvjf file_name.tar.bz2

Notice in tar command, there is -v parameter. It tells the application to show the extracted files (verbose).

Those are the standard way to extract. If you need more functionality, just use man command.

man unzip

man tar

Avoid Direct Download

How to Create Environment Variables in Linux

Dagu — Sun, 19 Apr 2009 05:39:00 +0000

This tutorial is still about creating environment variables, just like my last tutorial. But now I create environment variable in Linux, not Windows.

To create or edit environment variable in linux is very easy. You may create or edit environment variable from terminal.

The syntax is: export VAR_NAME=var_content

For example:

export JAVA_HOME=/usr/lib/jvm/sun-java6

Yes, very easy right? If you want to append content to an existing variable, you can’t use command above. Command above will create a new variable, not append it. To append content, you may use command below.

The syntax is: export VAR_NAME=$VAR_NAME:var_content

For example:

export PATH=$PATH:/usr/lib/jvm/sun-java6/bin

or, if you have created JAVA_HOME variable, you may use command below:

export PATH=$PATH:$JAVA_HOME/bin

Easy right?

Note:
To define a variable, you don’t need ‘$‘ character. But when you use it (for example when you append variable content), don’t forget ‘$‘ character.

How to Create Environment Variables in Windows

Dagu — Sat, 18 Apr 2009 07:08:48 +0000

If you are Windows user and need to create environment variables (some programming language need to set environment variables to run well), here is the step by step. Note that this tutorial is based on Windows XP.

1) Right click icon My Computer and choose Properties. You can find My Computer in Windows Explorer, or in Start Menu.

2) Click Tab Advanced. In this tab you will find Environment Variables Button below. Click that button.

Environment Variables Windows XP

3) There are two options. User Variables and System Variables. Click New button to create a new variable or Edit button to edit existing variable.

System Variables

4) You’re done!

How to Create Environment Variables in Linux

How To Install Java in Linux Ubuntu

Dagu — Wed, 15 Apr 2009 04:53:30 +0000

Java is one of the most popular programming languages. I learned Java a few years ago. I learned it in Windows OS. Now I need to install it in Ubuntu. Here are the steps:

1) You need to update Ubuntu Repository. Type this command:

sudo apt-get update

Just wait till your Ubuntu Repository updated.

2) Now it’s time to install Java. If you are developer, you need JDK (Java Development Kit), but if not, you only need JRE (Java Runtime Environment). I will install JDK 6 in my Ubuntu.

for JDK, here is the command:

sudo apt-get install sun-java6-jdk sun-java6-plugin

for JRE, here is the command:

sudo apt-get install sun-java6-jre sun-java6-plugin

3) After that, run command:

sudo update-java-alternatives -s java-6-sun

Then add the line “/usr/lib/jvm/java-6-sun” to the top of /etc/jvm file.

4) Check your Java installation using these commands:

java -version

the output:

java version "1.6.0_03"
Java(TM) SE Runtime Environment (build 1.6.0_03-b05)
Java HotSpot(TM) Client VM (build 1.6.0_03-b05, mixed mode, sharing)

if you install JDK, check Java compiler using:

javac -version

the output:

javac 1.6.0_03

5) You’re done!

Multiple Internet Explorer Installation

Dagu — Mon, 06 Apr 2009 14:26:21 +0000

As we know, Microsoft had released a brand new browser, Internet Explorer 8. This browser can render HTML and CSS much better than IE 6. I admit that Microsoft has so many improvements in IE 8. I hope all users who use IE 6 should upgrade their browser to IE 8.

But, I can’t make it comes true.. :sad: There are still a lot of people who use IE 6 to open their favorite websites. Fiuh… how come? And of course, it makes me as a website designer work harder. I should ensure my design will not ruin if I test it in any browser.

And you know what? IE 6 is the most frightening browser in the world. You may have a very good looking website in Firefox, but you can’t have it in IE 6. IE 6 will ruin everything. You can’t see PNG transparency without a bit hacking.

I know IE 6 sucks! But, I must realize that there are still many Internet users who use IE 6. And I still have to make a bit hacking to the HTML and CSS codes. So? What’s the problem?

I have upgraded my old IE 6 to IE 8. But I still need IE 6, to make sure my web design is cross-browser compatible. Of course I can’t install IE 6 after installing IE 8. So, how to install it?

I search on the Internet and found Multiple IE Installer by Tredosoft. We can choose what version of IE that we would like to install. There are IE 3, IE 4, IE 5, IE 5.5 and IE 6. I need only IE 6, so I only choose IE 6. Like other application run in Windows, use this installer is very easy.

Multiple IE

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