/etc/mysql/mariadb.conf.d/50-mysqld_safe.cnf is in mariadb-server-10.0 10.0.24-7.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | [mysqld_safe]
# This will be passed to all mysql clients
# It has been reported that passwords should be enclosed with ticks/quotes
# escpecially if they contain "#" chars...
# Remember to edit /etc/mysql/debian.cnf when changing the socket location.
socket = /var/run/mysqld/mysqld.sock
nice = 0
skip_log_error
syslog
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