Episode 818 – Using Screen in Linux, Motion Detection Webcam Software, and QT Interface Design

This time on the show Darren shares a heartwarming story about how a little plastic minifig saved the day using the Linux screen command. Shannon demos her favorite webcam software’s motion detection features, and Jason introduces interface design using the QT SDK.

Download HD Download MP4 Download XviD Download WMV

The Linux screen command

Available for most *nix platforms, screen is an invaluable resource for anyone managing multiple SSH sessions. In this segment Darren illustrates the screen command with a story of bits and bricks.

Motion Detecting Webcam Software
Shannon demos her favorite webcam software for Windows, yawcam.

Yawcam is written my Magnus Lundvall and means, quite literally, Yet Another WebCAM software. It’s free, but you can make a donation if you so choose to. Availability is for Windows only. Yawcam stands out to me because of the built in extras.


  • Video streaming
  • Image snapshots
  • Built-in webserver
  • Motion detection
  • Ftp-upload
  • Text and image overlays
  • Password protection
  • Online announcements for communities
  • Scheduler for online time
  • Multi languages

    Download the software at yawcam.com. In the main window you can enable or disable things that are visible to others. ‘File’ saves image files on local computer. ‘Ftp’ uploads to an ftp server. ‘Http’ can start a stream of webcam images. ‘Stream’ starts to stream video images, and ‘motion’ runs motion detection.

    Under File menu, you can find all the same stuff. Images to Movie can convert images into a movie, so you can choose this to upload images into a video file that you can play in quicktime. Under View menu, you can view different tabs, etc. Stealth mode hides the windows and tray icons. In the settings menu choose your webcam or detect it. Go to settings to change language, camera, connections, etc. Connection detects your public ip and lets you know if you are set up to connect online. File Output takes a photo and saves to a local computer at given intervals. Ftp output uploads images to an ftp server at certain intervals. Http output lets you view images on a dedicated webpage. Stream lets you stream video online. Page Designer lets you edit what the page looks like. You can also edit the HTML template files if you want more functionality. In motion detection you can save images to a path, or an ftp server, and under email settings you can email an image to a selected email.

    Interface Design with the QT SDK
    Jason joins us to demonstrate interface design using Nokia’s QT SDK.

    Keep up with the latest on Hak5 by follow us on Twitter or Facebook. Subscribe and get your weekly technolust delivered automatically. Or show your support and grab some swag from the HakShop – including the new airport friendly WiFi Pineapple and hoodie. Finally if you’d like to suggest a topic
    for ask a question feel free to hit up [email protected].


    • shunil

      just wanted to say thanks for the “screen” review. i had used it back in 2001 or so and had forgotten about it. Turns out i needed it again but forgot what it was called. 🙂

      thanks for the reminder and review!

    • E-TARD The LifeCaster

      This is cool eps and all but when will you guys get back to real hacking shows??
      I kind of miss that & the shows you have been doing are of thing I really don’t care about.
      the Time Division Multiplexing and Pulse Code Modulation eps’s ware cool but I dying to see more shows like Episode 810.
      Episode 810 now that was a good eps! 😀

    • Jonathan

      Thanks for the story, Darren. Feel better soon

      You can name screen sessions by specifying -S
      screen -S irc

      This is better than having to list the sessions to find the right one. On top of that, it beats playing “guess the right pid” with multiple sessions running


    • skimpniff

      The show hasn’t been the same since the HakHouse fell apart. Shits WEAK, wizzeak. Bring it back to the name sake Hak-ing, where are the days of rooting phones, multipass usbs, and wireless pwning?

    • Brigida

      You really make it seem so easy together with your presentation but I find this matter to be actually something that I think I might by no means
      understand. It sort of feels too complex and very huge for me.
      I’m having a look ahead to your subsequent submit, I
      will attempt to get the cling of it!

    • Douglas

      After all, a successful cosmetic surgery India with not much pressure
      on your wallet can make you look and feel much better.
      It is always better, skill, rather than speech of the surgeon to asses.

      Her weight has fluctuated through the years, but she generally
      tries to maintain an active lifestyle and healthy diet.

    You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong>