assert fact into file in prolog

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Published on 2010-05-21T21:31:54Z Indexed on 2010/05/22 0:20 UTC
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prolog

Hello everyone,

How can I assert a fact into a file without deleting the previous fact?

In the following line, when I execute it twice, the second fact overwrites the first fact:

tell('animal.txt'),write(Animal),nl,told.

But when I use assert or assertz it will do nothing.

Help me please.

Thank you :)

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assert fact into file in prolog

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