Prompt for password:
mysql -u username -p databasename < filename.sql
Enter password directly (not secure):
mysql -u username -pPlainPassword databasename filename.sql
Example:
mysql -u root -p wp_users < wp_users.sql mysql -u root -pPassword123 wp_users --default-character-set=utf8 < wp_users.sql
See also:
4.5.1.5. Executing SQL Statements from a Text File