rsyslog loses some messages
You write your good program to use the rsyslogd installed on your system. You would have a bunch of log lines, but you can't see any. Check this:
Fekete Zoltán Tue, 12/04/2018 - 07:35

Extract one database from mysql/mariadb full dump

Submitted by Fekete Zoltán on Thu, 07/26/2018 - 13:51

Save this script into an sh file:

#!/usr/bin/env bash


SED_FILTER="/^-- Current Database: \`$DBNAME\`/,/^-- Current Database: /p"

sed -n "$SED_FILTER" $INFILE > $DBNAME.sql

echo "Dump is ready: $DBNAME.sql"

exit 0

Run as :

$ sh script_name dbname full_dump_file

If you want to avoid problems during foreign key imports, then insert this line into the newly generated file after the USE <DBNAME>; statement: