Tag Archives: Shell

Save a list of installed packages on Ubuntu / Debian

In case your laptop crashes during your thesis writing it would be nice to have a list of which packets have been installed.

In Ubuntu / Debian or other some other distros there is a tool called dkpg which offers a small command that can be very helpful:

Saving that list in your backup routine (e.g. of your /home/ dir) every hour using crontab (linux scheduled tasks)

Set vim filetype by its file extension

For my project I am constantly edition ROS .launch files, which are some kind of xml.

If I want to use syntax highlighting for better readability, I used to type  :set filetype=xml . Which works, but gets kinda annoying in case you’ve got to type it multiple times a day.

In case you want to open .launch files with xml syntax by default, create a file in your .vim-folder:

Change into insert mode (press i) and paste following code into it:

Thats’s it, after that your vim will change:

before and default

before and default

after edits or set filetype=xml

after edits or set filetype=xml

Howto control CubieTruck onboard LEDs

Today I wanted to know, what this little blinking lights on my [amazon &title=CubieTruck&text=CubieTruck] mean.

There are four, which you find out if you use:

blue:ph21:led1 green:ph07:led4 orange:ph20:led2 white:ph11:led3

(or just look at it while it is running, usually it blinks a lot)


So if you want to know what each blink means you can ask the [amazon &title=CubieTruck&text=CubieTruck] like that:

So by default the

  • green LED is indicating if there is any read write with the SD Card
  • blue LED is heartbeating
  • orange LED is CPU0 load
  • white LED is CPU1 load

In case you want to turn off the LEDS, use this code:

See here for more information.