I know how to import an .sql file:
mysql -f -hlocalhost -uMYSQL_USER -pMYSQL_PASS -DMYSQL_DBASE < db.sql
and I know how to export straight into a gzip archive:
mysqldump -uMYSQL_USER -pMYSQL_PASS MYSQL_DBASE ¦ gzip -9 > db.sql.gz
Now how do I import that gzipped database with a single command?