Prepend text to mysqldump output at dump creation time

I am suffering from slow mysqldump/mariadb-dump. I found that disabling autocommit, unique_checks and foreign_key_checks boost import performance. I do that by prepending dump.sql with SET autocommit=0;SET unique_checks=0;SET foreign_key_checks=0; and by appending COMMIT;SET unique_checks=1;SET foreign_key_checks=1; to the end of it. Append is trivial, but when prepending I need to make a compromise between time or space consumed. Prepending with sed -i '0,/^/s//SET autocommit=0;SET unique_checks=0;SET foreign_key_checks=0;/' dump.sql can take a lot of time for large dumps, but it creates a single file. cat new-dump.sql" Is fast, but it creates another dump file and is therefore using a lot of space (even though it is just temporary) Is it possible to instruct mysqldump/maridb-dump to prepend and append a custom text to the dump when it is creating it?