https://anchor.host/combining-multiple-sql-files/
Combine SQL Files from the Command Line
Open up Terminal (on the Mac) and change directories to the where the SQL files are located.
cd /Users/currentuser/Downloads/snapshot-2016_12_07-11_14pm-full-0qmez2jjwi/wp-content/backupbuddy_temp/0qmez2jjwi
Next, run the following command to read all of the SQL files and produce a single SQL file.
cat *.sql > ~/Desktop/single.sql