automated input into dB

Hey AnzerPanzers,
a pre-question:
‘does batch processing refer specifically to DOS or can linux do batch processing(that is without dos emulation)

Hypothetical situation:
I have Mydb (mySQL & Linux)and I would like to store sales data from a variety of sources.

the question:
When I have accumulated large amounts and varieties of data and stored them in files in different formats. And I have created tables for the data, then what tools or languages would make uploading efficient?

TAK,
Jesper