Reset mysql5 root password in macports

Question

I've just installed macports through macports 1.9.2 on Snow Leopard. Now I can't use mysql because it seems as if I didn't know the password.

$ sudo mysql5 -u root -p 
Enter password:  
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

I'm not sure if this is some error in the install or usage, or I just forgot the password, but I think I need to reset the password. How to do it?

UPDATE: I can start and stop my MySql server, so it shouldn't be broken, but I don't have a command like $ sudo /opt/local/lib/mysql5/bin/mysqld_safe5.

$ ls /opt/local/lib/mysql5/bin/
innochecksum            mysql_client_test       mysql_secure_installation   mysqlbinlog         mysqlimport         ndb_drop_index          ndb_select_all          resolve_stack_dump
msql2mysql          mysql_client_test_embedded  mysql_setpermission     mysqlbug            mysqlshow           ndb_drop_table          ndb_select_count        resolveip
my_print_defaults       mysql_config            mysql_tzinfo_to_sql     mysqlcheck          mysqlslap           ndb_error_reporter      ndb_show_tables
myisam_ftdump           mysql_convert_table_format  mysql_upgrade           mysqld_multi            mysqltest           ndb_mgm             ndb_size.pl
myisamchk           mysql_find_rows         mysql_waitpid           mysqld_safe         mysqltest_embedded      ndb_print_backup_file       ndb_test_platform
myisamlog           mysql_fix_extensions        mysql_zap           mysqldump           ndb_config          ndb_print_schema_file       ndb_waiter
myisampack          mysql_fix_privilege_tables  mysqlaccess         mysqldumpslow           ndb_delete_all          ndb_print_sys_file      perror
mysql               mysql_install_db        mysqladmin          mysqlhotcopy            ndb_desc            ndb_restore         replace