MySQL Initialization change password problem (Mac system)

Today the company Daniel helped me fix the MySQL initialization password problem, record:

~ PS aux | grep MySQL
Metro 7149 0.0 0.0 2432772 564 s000 r+ 7:16 pm 0:00.00 grep--color=auto--EXCLUDE-DIR=.BZR--exclude-dir=cvs--exclude-dir =.git--exclude-dir=.hg--exclude-dir=.svn MySQL
_mysql 6942 0.0 5.4 3087448 456932?? Ss 7:14 pm 0:00.42/usr/local/mysql/bin/mysqld--user=_mysql--basedir=/usr/local/mysql--datadir=/usr/local/mysql/ Data--plugin-dir=/usr/local/mysql/lib/plugin--log-error=/usr/local/mysql/data/mysqld.local.err--pid-file=/usr/ Local/mysql/data/mysqld.local.pid
? ~/usr/local/mysql/bin/mysqladmin-u root Password
New Password:
Confirm New Password:
/usr/local/mysql/bin/mysqladmin:passwords don ' t match
? ~/usr/local/mysql/bin/mysqladmin-u root Password
New Password:
Confirm New Password:

MySQL Initialization change password problem (Mac system)