The command line option in SSH is:
mysqldump -d -u username_user -p username_dbname > file.sql
Where "username_dbname" is the name of your database, and "file.sql" is the name of the file you would like to write the table structure to. It will prompt you for a password (-p) and this is required. Normally, mysqldump gives you the entire database, with the "-d" option, you tell it to not include the data, but just the table structure.
Click Here for information on requesting SSH access.
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