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Special Rasberrypi

On Mac

how to write an image onto an sd card

sudo dd if=~/Downloads/my_pi.img of=/dev/disk4 bs=1m

change disk4 to whatever number your sd device in bound to

how to backup an image from an sd card

sudo dd of=~/Downloads/my_pi.img if=/dev/disk4 bs=1m

how to only backup 8GB from a 32GB

sudo dd of=~/Downloads/matpi_2015-01-13.img if=/dev/disk5 bs=1m count=7948

On linux

how to write an image onto an sd card

sudo dd bs=4M if=raspbian.img of=/dev/sdb

how to backup an image from an sd card

sudo dd bs=4M if=/dev/sdb of=raspbian.img

How to copy from sd card to sd card

sudo dd if=/dev/sda of=/dev/sdb bs=4M conv=sync,noerror

How to find the information about the partitions

sudo fdisk -l

Same on an image

sudo fdisk -l -u image.img

Here is an article to deal with SD card size mismatching size issues:

here

how to change hostname

sudo vim /etc/hostname 
sudo /etc/init.d/hostname.sh
sudo vim /etc/hosts

how to change ssh fingerprint on a server

  • Step # 1: Delete old ssh host keys

Login as the root and type the following command to delete files on your SSHD server:

# /bin/rm -v /etc/ssh/ssh_host_*
  • Step # 2: Reconfigure OpenSSH Server

Now create a new set of keys on your SSHD server, enter:

# dpkg-reconfigure openssh-server

How to setup Clojure dev environment on Raspberry pi

setup the repl timout to a very large value inside the project.clj:

:repl-options {:init-ns user
	       :timeout 300000}

start repl headless with the ip address of the pi:

lein repl :headless :host 192.168.***.*** :port 4567

on mac connect onto:

nfs://matpi.local/home/mathieu/clojure
lein repl :connect nrepl://192.168.*.*:4567

Printers

How to setup an HP printer like the Office Deskjet 8600 ?

  • sudo apt-get install hplib hplib-gui
  • sudo groupadd printadmin
  • sudo usermod -aG printadmin pi
  • add SystemGroup printadmin at the end of /etc/cups/cupsd.conf
  • reboot machine
  • http://localhost:631 or go to Menu -> Preferences -> HPLIB Toolbox
  • Follow install process to add printer

see this for more info