When you need to back up the table structure from the MySQL database
# mysqldump -d -h localhost -u root -pmypassword databasename > dumpfile.sql
The only option that is different than creating an entire backup is the -d switch, which tells mysqldump not to output the data.
Example:
mysqldump -d -h localhost -u root -p2Uad7as9 database01 > dumpfile.sql