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Raspberry Pi 4 Cheat Sheet

List of commands, configurations and tips for Raspberry Pi and Linux beginners. Also known as a quick start guide.

Table of contents

Raspberry Pi OS / Linux

Pi user default password

Default password for pi user is "raspberry"

Enable SSH

To enable SSH, which is disabled by default in Raspbian, just put an empty ssh file with no extension on /boot partition.

Useful configs

Go to /boot/config.txt and add these entries in the end of the file.

Or directly from terminal
sudo nano /boot/config.txt

Overclocking

CPU
over_voltage=6
arm_freq=2000
core_freq=600
GPU
gpu_freq=750
gpu_mem=128
Override temperature limit
temp_limit=75

Enable 64-bit kernel

arm_64bit=1

Miscellaneous

Prevent HDMI TV from turning on when Raspberry Pi is booting

hdmi_ignore_cec_init=1
Disable splash screen
disable_splash=1
Disable Wi-Fi
dtoverlay=disable-wifi
Disable Bluetooth
dtoverlay=disable-bt
Disable camera
start_x=0

Beta / stable releases

Edit rpi-eeprom-update file
sudo nano /etc/default/rpi-eeprom-update
and change content to
FIRMWARE_RELEASE_STATUS="beta"
or
FIRMWARE_RELEASE_STATUS="stable"

Shutdown / Reboot

Shutdown
sudo shutdown -h now
Reboot
sudo shutdown -r now
Uptime
uptime -p
Last boot time
uptime -s

Kernel version

Check kernel version and info
uname -a

Working with PATH variable

Print PATH variable line by line
echo $PATH | tr : '\n'.
Add to PATH
export PATH=<path to be added>:$PATH

Update / Upgrade everything

One-liner
sudo apt-get update -y && sudo apt-get upgrade -y && sudo apt-get dist-upgrade -y && sudo apt-get autoremove -y && sudo rpi-eeprom-update -a

Read system logs in real-time

List last 30 lines from system logs and updates in real-time
tail -f -n 30 /var/log/syslog

Audio

Testing audio on default output
speaker-test -c2 -twav -l7

MicroSD

Benchmark
sudo apt install agnostics
sh /usr/share/agnostics/sdtest.sh

Chromium / Chrome

Chromium screen tearing fix
sudo rm /etc/xdg/autostart/xcompmgr.desktop

Read temperature

One time read CPU temp
echo "$(($(</sys/class/thermal/thermal_zone0/temp)/1000))'C"
One time read GPU temp
vcgencmd measure_temp
One time read GPU temp
watch -n 0.1 vcgencmd measure_temp

RAM

Currently free memory and swap usage
free -m

Date

Display date and time
date

Cron

View cron tab
crontab -e
View Cron logs
grep CRON /var/log/syslog

Repositories

Add source
curl -sS https://download.spotify.com/debian/pubkey.gpg | sudo apt-key add - 
List sources
sudo apt-key list
Remove source
sudo apt-key del "2EBF 997C 15BD A244 B6EB  F5D8 4773 BD5E 130D 1D45"

Connectivity

Wi-Fi

Scan for nearby Wi-Fi networks
sudo iwlist wlan0 scan
Setup Wi-Fi password through terminal
sudo nano /etc/wpa_supplicant/wpa_supplicant.conf
Add this entry to the file with changed SSID and Password
network={
    ssid="Wi-Fi SSID"
    psk="WiFI Password"
    key_mgmt=WPA-PSK
}

Bluetooth

Scan for nearby bluetooth devices
sudo hcitool scan

Network

Check public IP
curl ifconfig.me

Pi-hole

Installation

Original instruction is missing sudo for bash
sudo curl -sSL https://install.pi-hole.net | sudo bash

Repair install

pihole reconfigure

Set password

Set password for the dashboard or completely remove it
pihole -a -p

Upgrade Pi-hole

Download and install the latest version
pihole -up

Pi-hole Crontab

Edit pi-hole crontab for auto-updates
sudo nano /etc/cron.d/pihole
And change appropriate line to in example:
0 2 * * *   root    PATH="$PATH:/usr/sbin:/usr/local/bin/" pihole updateGravity >/var/log/pihole_updateGravity.log || cat /var/log/pihole_updateGravity.log
Which means every day at 2AM

Update Gravity

Download latest blocklists
pihole updateGravity

Gravity update logs

Read last gravity update logs or watch it in real-time.
tail -f -n 30 /var/log/pihole_updateGravity.log

Set additional DNS servers

Pi-hole dashboard allows to set only 1 custom DNS server
sudo nano /etc/pihole/setupVars.conf
Then add new servers like this
PIHOLE_DNS_1=8.8.8.8
PIHOLE_DNS_2=2001:4860:4860:0:0:0:0:8888
PIHOLE_DNS_3=1.1.1.1
PIHOLE_DNS_4=2606:4700:4700::1111
PIHOLE_DNS_5=62.179.1.60
PIHOLE_DNS_6=62.179.1.61
PIHOLE_DNS_7=62.179.1.62
PIHOLE_DNS_8=62.179.1.63
Restart service
sudo service pihole-FTL restart

Git

Configuration

Create store for user credentials
git config --global credential.helper store
Set account's default identity
git config --global user.email "[email protected]"
git config --global user.name "Lukasz Lapaj"

Node.js

Installation

Preinstalled Raspberry Pi OS repository version is outdated, use version below:
curl -sL https://deb.nodesource.com/setup_16.x | sudo -E bash -
sudo apt-get install -y nodejs

Docker

Installation

Remove old versions
sudo apt-get remove docker docker-engine docker.io containerd runc
Install pre-requirements
sudo apt-get install apt-transport-https ca-certificates curl gnupg-agent software-properties-common
Add Docker’s official GPG key
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
Install docker
sudo apt-get install docker-ce docker-ce-cli containerd.io

Speedtest.net

Installation

Pre-requirements
sudo apt-get install gnupg1 apt-transport-https dirmngr
export INSTALL_KEY=379CE192D401AB61
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys $INSTALL_KEY
echo "deb https://ookla.bintray.com/debian generic main" | sudo tee  /etc/apt/sources.list.d/speedtest.list
Install
sudo apt-get install speedtest