cat backup-my.cnf innodb_doublewrite_file=innodb_doublewrite
cat my.cnf innodb_doublewrite_file = /log/mysql-bin/innodb_doublewrite
cat backup-my.cnf doublewrite_ file=innodb_ doublewrite
innodb_
cat my.cnf doublewrite_ file = /log/mysql- bin/innodb_ doublewrite
innodb_