Terminal Utilities

  • Alsamixer- This utility let you change the volume of speaker or headphone from the terminal.
  • Xbacklight– Changes brightness of screen from the terminal

$xbacklight 50

This will change the brightness to 50%.

  • Links- Another utility which will blow your mind is links. Have you  ever wonder that we can use a browser from the terminal? yes! we can do this.

Links is a Text-based web browser.

  • mc– Midnight commander is an Advanced file manager in the terminal.
  • Glances– This shows the status of your computer.
  • moc- This tool is for the music lovers. By using this tool you can run any mp3 file in terminal.



I3 Window manager

Fed up from using Alt + tab again and again for switching windows? Also In the Operating system, we have to manually manage the windows or if we want to work on two windows at the same time say terminal as well as firefox you have to manually manage them.

But wait let me introduce with a super awesome tool which will automate your work. Rather  concentrating on managing different windows you will concentrate on the work.. And the tool is I3 Window manager.

i3 is a text-oriented (and keyboard-oriented) window manager, where the other traditional desktops are graphic-oriented (and mouse-oriented) systems. That doesn’t mean that i3 doesn’t use the mouse, of course. When we get to managing multiple windows later, it will be possible to select windows with mouse-clicks. But in i3 what is important is that you can easily manipulate windows without the mouse, using only the keyboard. In fact, this is such an important objective for i3 that the developers and users are pleased and proud when they can say, ‘I did  (whatever) without even touching the mouse’.

you can install i3 from here.



Installing VPL-Jail server.

As I have discussed a little bit about Jail server in previous blog post. Now why we need to install Jail server?

The VPL module is compatible with Moodle 2.3, 2.4, 2.5 and 2.6. VPL version 3.0 is compatible at data level and backups, with the 2.X versions of VPL. This new version requires execution servers with vpl-jail-system 2.0.

Now, How to install it?

It’s simple Just Go to official Site and install it.

that’s it!

Now if you are facing trouble then debug using
“$sudo service vpl-jail-system start -d 8”
and check errors in the log file /var/log/syslog

I want to discuss the problem which I faced during configuration. Firstly, When I start the server using
$sudo service vpl-jail-server start
my internet packet drops and when I stop the server using
$sudo service vpl-jail-server stop
internet connection works fine. And the other problem which I faced is conflicts of ports due to the apache server. As no two servers run on a single port.

1. Change the port number in configuration file i.e /etc/vpl/vpl-jail-system.conf
#PORT 80 (default one) to PORT 8080
2. For internet packet problem you may troubleshoot by changing the firewall setting in configuration file.
and here we are done. 🙂

For checking open web browser and write


It will show msg of OK.