I found this well-matured article about Ubuntu possibilities. Good stuff, check it out:

10 Things You Didn’t Know You Could Do In Ubuntu

1. Create website links that automatically install software

Did you know that you can create a link that will automatically launch Ubuntu’s package manager and install the software? This is very useful if you are helping someone install certain programs in Ubuntu. To create ’software install hyperlink” just create a hyperlink but instead of pointing to the usual HTTP:// address, use

apt:< package name >

So if you are trying to install firefox, create a hyperlink and put apt:firefox in Hyperlink bar. This will create a hyperlink that will launch the package manager and install the package when clicked.

2. Do stuff without touching the mouse

If you know how to launch the ‘Run’ dialog box in Windows, this certain command is also available in Ubuntu. Press ALT+F2 and the similar ‘Run’ dialog box will appear, type in the command or the program name, let’s say firefox, hit enter, and firefox will launch.

3. Instantly Search Google for Any Word or Phrase

Googlizer is an app that you can install (this is available from the package manager) and use it to search Google for anything using the keywords directly from your file. An example is if you have a PDF file that contains the word ‘lethargy’, with Googlizer, all you need is to highlight the word and click Googlizer’s icon to search the web.

4. Create a File Delete Command That Uses the Trash

If you are a frequent user of rm command, you can create a command that will move the file you wish to delete to the Trash directory, instead of completely deleting the file. To do this, just use the command alias and few tweaks with Linux files:

– Open a terminal window, and type gedit ~/.bashrc
– Add this line after the last line of the file:

alias trash=”mv -t ~/.local/share/Trash/files –backup=t”

– Save and close.

To use the command, you need to use the trash command instead of rm:

trash mydoc.txt

5. Repair Windows from Within Ubuntu

You can mount your Windows partition inside your Ubuntu and do stuff with it. With the stuff I mean you can access your files in Windows partition, or you can also repair it within Ubuntu. To be able to repair a near-death Windows partition, unmount it and use the command ntfsfix:

sudo ntfsfix /dev/sda1

This is assuming that your Windows partition is /dev/sda1 and the filesystem used is NTFS.

6. Dump the Text on a Virtual Console to a File

Large files can be tiresome to read so you may want to filter the words that you need and dump into a new and smaller file. This can be done using this command:

ls > output.txt 2>&1

The command will execute ls command, put the results into the output.txt file and display errors if there are any.

7. Instantly Hide a File or Folder

In Linux, any file that begins with a period (.) is considered as a hidden file. So if you want to hide a certain file from a younger sibling or parent, rename a file and put. at the beginning of the filename

mv grades.txt .grades.txt (use this command inside a terminal)

Or if inside Nautilus, highlight the file, press F2, and rename the file.

8. Print at the Command Line

Did you know that you can print files from the command line? Try this command to print a file without the fancy format for fast printing:

lp -o page-top=72 /home/myfile.txt

This is a quick and dirty way of printing files since the formatting is disregarded, but very useful if you want to print something fast and easy.

9. Listen to MP3s when no GUI is running

If you need to work in your Ubuntu using text mode only and no GUI running, install vlc using the apt-get command and use it to play your MP3 music from the command line:

vlc -I ncurses /home/*.mp3

This will play all mp3 files in the /home folder using the CLI mode of vlc.

10. Turn your desktop into your /home folder

If you want to make your default Desktop directory into something else beside the typical /home/user/Desktop location, you can do so by hitting Alt+F2 and type in gconf-editor. This will launch the gconf-editor app, put a check beside /apps/nautilus/preferences, save and exit. The change will take after your next login.

Thanks to Keir Thomas via PionyTux Weblog http://www.pinoytux.com

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IPTables is an application program that allows to set up, maintain, and inspect the tables of IP packet filter rules provided by the Linux kernel.

All IPTables rules are stored on /etc/iptables.rules
You can open/close any port from it and then restart the network by running “etc/init.d/networking restart”

Before opening or closing ports, we recommend to first verify if the port is open or closed and who is using the port. There a number of different commands:

Commands to verify ports:

nmap IP#

nmap localhost

netstat –ntulp

to verify the single port

netstat -nap | grep  <port #>

to list all current rules in iptables

iptables -L

For opening a TCP port:

iptables -A INPUT  -p tcp –dport <port #> -j ACCEPT

For opening a UDP port:

iptables -A INPUT -p udp –sport <port #>  -j ACCEPT

Save changes:

iptables-save > /etc/iptables.rules

If you need to disable the firewall temporarily, you can flush all the rules using:

iptables -F

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For more detailed information visit

Iptables Description by Ubuntu Manuals

Iptables How-To for Ubuntu by Ubuntu Manuals

Iptables How-To for Debian by wiki.debian.org