/raspberry-pi-maintenance

Raspberry Pi scripts for maintenance

Observability

linux-perf-observability-tools.jpg

Prints disc space

df -h

Lists all packages and sorts them by size

dpkg-query -Wf '${Installed-Size}\t${Package}\n' | sort -nr | more

Packages for removal

sudo apt-get remove --purge wolfram-engine

sudo apt-get remove --purge libreoffice

sudo apt-get remove --purge libreoffice-core

sudo apt-get remove --purge libreoffice-common

sudo apt-get remove --purge scratch

sudo apt-get remove --purge scratch2

sudo apt-get remove --purge scratch3

sudo apt-get remove --purge minecraft-pi

sudo apt-get remove --purge sonic-pi

Cleaning after removing packages

sudo apt-get clean

sudo apt-get autoremove

Find all directories with size larger than 1GB (or 1MB if you change G to M after the pipe) and print only files up to 4th depth level

sudo du -xh -d 4 / | grep -P "G\t"

Find all files of Megabyte'ish/Gigabyte'ish size in current directory

ls -lah | grep "M "

ls -lah | grep "G "

Rotating logs and configuring lor rotate

https://www.linode.com/docs/guides/use-logrotate-to-manage-log-files/

Print all services and their status

systemctl list-units --type=service

Print all cron jobs

crontab -l

Print cron logs from syslog

grep CRON /var/log/syslog

tail -f /var/log/syslog

Backup through ssh

check where is your disc in /dev

lsblk -p

copy whole disc content over ssh (gzipped)

ssh pi@192.168.1.38 'sudo dd bs=4M if=/dev/mmcblk0 status=progress | gzip' | dd of=pi_os_backup.gz

additional info on backup restoring

https://www.raspberrypi.org/documentation/installation/installing-images/linux.md

save ssh key

ssh-copy-id -i ~/.ssh/klucz grizwold@192.168.1.38 https://www.ssh.com/ssh/copy-id

ssh access for headless

For headless setup, SSH can be enabled by placing a file named ssh, without any extension, onto the boot partition of the SD Card. When the Raspberry Pi boots, it looks for the ssh file. If it is found, SSH is enabled and the file is deleted. The content of the file does not matter; it could contain text, or nothing at all.

prepare WIFI for headless

https://raspberrypi.stackexchange.com/questions/10251/prepare-sd-card-for-wifi-on-headless-pi

The Raspberry Pi Foundation's Raspberry Pi Imager now has an advanced options menu which is accessed by the keyboard shortcut Ctrl+Shift+X. You can set hostname, allow SSH (including changing user password), configure wifi and set locale. Note that this tool also appears to have telemetry built in, which can be turned off from the GUI.

Controlling RPi from Android

https://play.google.com/store/apps/details?id=it.Ettore.raspcontroller&hl=en&gl=US

Working with GPIO

https://www.ics.com/blog/gpio-programming-using-sysfs-interface

Welcome screen

Custom bash welcome screen. Create file /home/pi/.bash_profile:

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 int($2/1024)'}`/`cat /proc/meminfo | grep MemTotal | awk {'print int($2/1024)'}` MB
( : '~'.~.'~' : ) Free Disk Space....: `df -Pkh | grep -E '^/dev/root' | awk '{ print $4 }' | awk -F '.' '{ print $1 }'` on /dev/root
 ~ .~ (   ) ~. ~  Load Averages......: ${one}, ${five}, ${fifteen} (1, 5, 15 min)
  (  : '~' :  )   Running Processes..: `ps ax | wc -l | tr -d " "`
   '~ .~~~. ~'    Temperature........: `/usr/bin/vcgencmd measure_temp`
       '~'
$(tput sgr0)"

Temperature

command:

/usr/bin/vcgencmd measure_temp

outputs:

temp=43.3'C