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Changing part of a file

Comment:

Can anybody tell me how to change part of a File by running a .BAT file E.g. I have a .TFR file containing the line SYSTEM XXXXXX I need to run a .BAT file to change XXXXXX to the value of a variable I input but not change any of the other data in the .TFR file hope this is clear enough.

Internet on my 286

I need help on DOS batch ...

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