Knowledge Sharing » Linux

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

Send Message Over Linux Console

Dagu — Sat, 16 May 2009 02:41:28 +0000

Why do we send message over linux console? We can send message using our favorite messenger. That’s right. But, imagine if you are working in a linux machine using a console and want to talk to another user without moving from your console. To do this, you can use a command named write.

Ummm… how if I want to know who’s accessing a linux machine? You can use command who. Ok how to use write command? It’s easy.

write user [ttyname]

Example:

$write dani
Hi.. how u doin?
You need to sign the contract.

You can write your message in the new line. If you want to stop it, you may use Ctrl+C.

What will appear in user dani?

Message from gunawan@linuxmachine on pts/3 at 09:16 ...
Hi.. how u doin?
You need to sign the contract.
EOF

notice that at the end of message you will see EOF.

Who’s Accessing Your Linux Box?

Dagu — Sat, 16 May 2009 02:13:40 +0000

An easy way to view who’s accessing a linux machine is using command named who. $ who dani pts/0 May 16 08:16 (10.1.12.12) akachan pts/1 May 16 08:20 (10.1.12.51) dewi pts/2 May 16 08:39 (10.1.12.94) easy isn’t it? Related posts: Send Message Over Linux Console How to Create Environment Variables in Linux Related posts:

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.

Checking Disk Capacity in Linux

Dagu — Tue, 13 Nov 2007 05:14:00 +0000

In my work, I should be familiar with linux server. Because it uses CLI (Command Line Interface), then it’s a bit difficult to use. One of my problems is how to check disk capacity. Previously, my friend had told me, but I forget it :(. In order not to forget it, I will share it in my blog. So, if I forget it, I only need to open my blog.. :)

Command to check disk capacity is df. Short description: df – report filesystem disk space usage. Use man df to get more information.

Usage example:

$ df
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/sda1             14877092   9090552   5018636  65% /
/dev/shm               1037556         0   1037556   0% /dev/shm
/dev/sdb1             68890968  24462748  40872236  38% /home
/dev/sda5             14877060   6418492   7690664  46% /var

Oops, it’s not clear enough. To make it clear, add -h parameter.

$ df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda1              15G  8.7G  4.8G  65% /
/dev/shm             1014M     0 1014M   0% /dev/shm
/dev/sdb1              66G   24G   39G  38% /home
/dev/sda5              15G  6.2G  7.4G  46% /var

Hmm… it’s better, isn’t it?

How to Create Environment Variables in Linux