Custom Raspberry Pi Console Login Message

The Raspberry Pi tweaking continues. I did a fresh install of my first project to make sure that I documented all the steps correctly. To make sure I didn't loose any work I created a backup of the SD card.

The documentation was relatively complete. I did miss some things I added to the Pi, but forgot to document. One of these was a nicer welcome screen when you log in to the Pi via console or SSH.

I added the following to the /etc/bash.bashrc file for all users, or just in the ~/.bash_profile file (at the end):

let upSeconds="$(/usr/bin/cut -d. -f1 /proc/uptime)"
let secs=$((${upSeconds}%60))
let mins=$((${upSeconds}/60%60))
let hours=$((${upSeconds}/3600%24))
let days=$((${upSeconds}/86400))
UPTIME=`printf "%d days, %02dh%02dm%02ds" "$days" "$hours" "$mins" "$secs"`

# get the load averages
read one five fifteen rest < /proc/loadavg

echo "$(tput setaf 2)
   .~~.   .~~.    `date +"%A, %e %B %Y, %r"`
  '. \ ' ' / .'   `uname -srmo`$(tput setaf 1)
   .~ .~~~..~.   
  : .~.'~'.~. :   Uptime.............: ${UPTIME}
 ~ (   ) (   ) ~  Memory.............: `cat /proc/meminfo | grep MemFree | awk {'print $2'}`kB (Free) / `cat /proc/meminfo | grep MemTotal | awk {'print $2'}`kB (Total)
( : '~'.~.'~' : ) Load Averages......: ${one}, ${five}, ${fifteen} (1, 5, 15 min)
 ~ .~ (   ) ~. ~  Running Processes..: `ps ax | wc -l | tr -d " "`
  (  : '~' :  )   Local IP Addresses.: `$(hostname -I)`
   '~ .~~~. ~'    WAN IP Address.....: `wget -q -O - | tail`
       '~'        Weather............: `curl -s "|NL|NL001|UTRECHT|" | sed -n '/Currently:/ s/.*: \(.*\): \([0-9]*\)\([CF]\).*/\2°\3, \1/p'`
$(tput sgr0)"

The result is this:

I got the 'original' script form the Raspberry Pi forum, and I altered the IP Address section and the weather forecast.

Posted on June 22, 2015 and filed under Tips'n Tricks, Raspberry Pi.

Rsync And Encrypted Containers

My 'little' off-site Raspberry Pi backup/remote storage project will probably use a combination of Bittorrent Sync and rsync. The latter will be used to backup personal information, but I want that data to be absolutely secure. So I want to use encryption. Preferably by using container that I can mount (e.g. Truecrypt or the Apple OSX encrypted disk images).

The problem with containers is that many backup solutions tend to backup / transfer the entire container when a change occurred. Thankfully, rsync only copies the changes.

Posted on June 20, 2015 and filed under Raspberry Pi, Security, Software, Tips'n Tricks.

Raspberry Pi 2 and PiTFT 480x320 Touchscreen

I'm starting to experiment with the Raspberry Pi form several purposes. For one of my little projects (RTL-SDR Scanner) I need a little TFT screen on the Pi. So I bought the 3.5 inch PiTFT 480x320 Touchscreen.

Getting it to work was not as easy as the tutorial would like it to be. I tried the 'advanced' setup with the DIY Installer script first, but that didn't work at all. The screen stayed bright white. No console or desktop to be found. So after that I tried the easy install where I needed to download an image with all the stuff included.

Posted on June 2, 2015 and filed under Tips'n Tricks, Hardware, Raspberry Pi.