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Gforth Manual

3.26.5 Close files

fd-in close-file throw fd-out close-file throw

Likewise, you can put that into definitions, too:

: close-input ( -- ) fd-in close-file throw ; : close-output ( -- ) fd-out close-file throw ;

Assignment:

How could you modify copy-file so that it copies until a second line is matched? Can you write a program that extracts a section of a text file, given the line that starts and the line that terminates that section?