See the List of all mysqladmin flush commands
Examples :-
# mysqladmin -u root flush-hosts
# mysqladmin -u root flush-logs
# mysqladmin -u root flush-privileges
# mysqladmin -u root flush-status
# mysqladmin -u root flush-tables
# mysqladmin -u root flush-threads
flush-hosts: It is flush all information in the host cache.
flush-privileges: It is reload the grant tables.
flush-status: It is clear status variables.
flush-threads: It is flush the thread cache.