Multiple processing of a text file

From: Ken Rock (ken88r...)

I hope I'm on the correct user group.
I need to input a text file into a program and store the treated text file. Using mac Terminal, I can get it to work cmd/program <text001.txt >nutext001.txt. I have to do this many times i.e. text001.txt to text100.txt.
This will be very tedious in Terminal by direct input. Please can anyone suggest a quicker way to do it?

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