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To remove some data from the database:
ret = gdbm_delete(dbf, key);
The parameters are:
The ret value is -1 if the item is not present or the requester is a reader. The ret value is 0 if there was a successful delete.
gdbm_delete removes the keyed item and the
key from the database
dbf. The file on disk is updated to reflect the structure of the new
database before returning from this function.
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