Get Latest Raspberry Pi OS image

raspios.sh

#!/bin/bash
# Downloads, checks and unzips the latest image file for RaspiOS Lite
# Get the download URL for the latest version
dlurl=https://downloads.raspberrypi.org/raspios_lite_armhf_latest
url=$(curl -ILs -w %{url_effective} $dlurl | tail -1)
expect=$(curl -s "$url.sha256" | cut -d" " -f1) # checksum
curl -sL -o raspios.zip $url

# Check the downloaded file
actual=$(sha256sum raspios.zip | cut -d" " -f1)
if [ "$actual" != "$expect" ]
then
    echo "downloaded file failed checksum test"
    echo "download sum: $actual"
    echo "expected sum: $expect"
    exit 1
fi

# Inflate the zip file
unzip -oq raspios.zip
imgfile=$(ls *.img | tail -1)
rm raspios.zip
echo $imgfile