MySQL8에서 문자 집합을 일괄 수정하기 위한 스크립트를 작성하는 방법

select concat('alter database ',schema_name,' default character set utf8mb4 collate utf8mb4_0900_ai_ci;') 
  from information_schema.schemata 
 where schema_name not in ('sys','mysql','performance_schema','information_schema') 
   and lower(default_collation_name) in ('utf8mb4_general_ci','utf8_general_ci');

/home/mysql/mysql-8.0.16-linux-glibc2.12-x86_64/bin/mysql -uroot -h20.0.0.18 -P3306 -p70n6w+1XklMu -N < change_database_characset.sql > change_database_characset_result.sql
/home/mysql/mysql-8.0.16-linux-glibc2.12-x86_64/bin/mysql -uroot -h20.0.0.18 -P3306 -p70n6w+1XklMu -f < change_database_characset_result.sql > change_database_characset_result.out 2>&1