How to modify the mysql password and forget the mysql password

Modify the MySQL password:
Copy codeThe Code is as follows:
Mysqladmin-u root-p password 123456
Mysqladmin-u username-p old password New password

Forget the MySQL password:
Copy codeThe Code is as follows:
Chown-R mysql: mysql/var/lib/mysql
/Etc/init. d/mysql stop or kill-9 to kill the process.
[Root @ corshetlpro01 bin] # cd/usr/local/mysql/bin
./Mysqld_safe -- user = mysql -- skip-grant-tables -- skip-networking &
[Root @ corshetlpro01 bin] # ps-ef | grep mysql
Root 26544 25356 0 00:00:00 pts/18/bin/sh./mysqld_safe -- user = mysql -- skip-grant-tables -- skip-networking
Mysql 26673 26544 0 00:00:00 pts/18/usr/local/mysql/libexec/mysqld -- basedir =/usr/local/mysql -- datadir =/var/lib/mysql -- user = mysql -- skip-grant-tables -- skip-networking -- log-error =/var/lib/mysql/corshetlpro01.err -- pid-file =/var/lib/mysql/corshetlpro01.pid -- socket = /tmp/mysql. sock -- Ports = 3306
Root 27223 25356 0 00:00:00 pts/18 grep mysql
./Mysql-u root
Mysql> use mysql;
Mysql> update user set password = password ('newpassword') where user = 'root ';
Mysql> flush privileges;
Mysql> quit
#/Etc/init. d/mysql restart
# Mysql-uroot-p
Enter password: <enter the new password newpassword>