Print SHA Checksum
shasum -a 256 /home/rick/Downloads/2020-05-27-raspios-buster-full-armhf.zip
Save Checksum to File
shasum -a 256 /home/rick/Downloads/2020-05-27-raspios-buster-full-armhf.zip > hash.sha256
Verify Checksum from File
shasum -c hash.sha256