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tell/1
tell(+FileOrStream)
Makes file FileOrStream the current output stream.
file_spec or stream_object, must be ground
If there is an open output stream associated with FileOrStream,
and that stream was opened by tell/1
, then it is made the
current output stream. Otherwise, the specified file is opened for
output in text mode with default options and made the current output stream.
Different file names (that is, names that do not unify) represent different streams (even if they correspond to the same file). Therefore, assuming food and ./food represent the same file, the following sequence will open two streams, both connected to the same file.
tell(food) … tell('./food')
It is important to remember to close streams when you have finished with
them. Use told/0
or close/[1,2]
.
instantiation_error
FileOrStream is not instantiated enough.
existence_error
FileOrStream specifies a nonexisting file, and the fileerrors
Prolog flag is on
.
permission_error
FileOrStream is a stream not currently open for output, or
FileOrStream specifies a file with insufficient access
permission, and the fileerrors
Prolog flag is on
.
domain_error
FileOrStream is neither a file_spec nor a stream_object.
told/0
, open/[3,4]
, current_output/1
, ref-iou-sfh,
ref-lps-flg.