Migrate GPG keys - based on https://serverfault.com/questions/86048/how-to-backup-gpg

migrate-gpg.sh

# List keys
gpg --list-secret-keys |egrep -v 'sec|uid|ssb'

Populate list
keys="A1B2C3D4E5F67890A1B2C3D4E5F67890A1B2C3D4 FEDCBA9876543210FEDCBA9876543210FEDCBA98 1234ABCD5678EFGH1234ABCD5678EFGH1234ABCD"

for key in $keys; do echo "Processing $key"; gpg -k $key | grep uid; done

# Export

for key in $keys; do
	gpg --export --armor ${key} > ${key}.pub.asc
	gpg --export-secret-keys --armor ${key} > ${key}.priv.asc
	gpg --export-secret-subkeys --armor ${key} > ${key}.sub_priv.asc
done

gpg --export-ownertrust > ownertrust.txt

# Import

for key in $keys; do
	gpg --import ${key}.pub.asc
	gpg --import ${key}.priv.asc
	gpg --import ${key}.sub_priv.asc
done

gpg --import-ownertrust ownertrust.txt

# Ultimate trust - type trust, then 5 (which means "ultimate trust")

for key in $keys; do
	gpg --edit-key ${key}
done