Linux cheat sheet for Donkey Car

Once you ssh onto your Pi you are expected to use linux commands:

• cd | Change directory. When you are lost type ‘cd’ and you will end up in your home directory where you always start. ’~’ means your home directory, ‘..’ Means the directory above
• cd d2 | Go down into the ‘d2’ directory
• ls | List directory. You should get something like this:

(dk) pi@willburro:~/d2 $ ls

• config.py data logs manage.py models
• nano config.py | Edit donkeycar config file before you start the program
• history | Shows you all commands you recently typed. You get something like this:

…

746 python manage.py drive --model ~/d2/models/mypilot

747 sudo poweroff

748 cd d2

749 python manage.py drive --model ~/d2/models/mypilot

750 sudo poweroff

751 sudo nano /etc/wpa_supplicant/wpa_supplicant.conf

752 sudo power

…

• !746 | Reruns command numbered 746 above. Up down cursor will also show you previous commands, and Left right cursor allows you to edit your previous commands
• <Control-C> | Quits your current program
• rm -r ~/d2/data/tub_* | Deletes all data
• ls -1 ~/d2/data/tub_1_18-04-21/*.jpg | wc -l | Count number of pictures in the tub
• du -s ~/d2/data/* | Lists size of each tub

For more commands and its function, you may check out https://explainshell.com/

How to expand the partition in your SD Card

Raspberry Pi image is not using the whole SD card. You'll need to expand the partition to use all 16/32GB of the card.

Here are the steps:

1. SSH into your Raspberry Pi
2. Type `df -h` to see the current disk size, should be around 2.7G.
3. Type `sudo raspi-config` to configuration tool.
4. Select `7 Advanced Options`.
5. Select `A1 Expand Filesystem`.
6. Select `<Finish>` to exit configuration tool and reboot.
7. After the Raspberry Pi is rebooted, SSH back into it and type `df -h` again. You should see the disk size is around 30G now.

You can capture a lot more training data now!