SWI-Prolog -- tell/1

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Documentation
- Reference manual
  - Built-in Predicates
    - Input and output
      - Edinburgh-style I/O
        
        see/1
        
        tell/1
        
        append/1
        
        seeing/1
        
        telling/1
        
        seen/0
        
        told/0
- Packages

Availability:built-in

tell(+SrcDest)

Open SrcDest for writing and make it the current output (see set_output/1). If SrcDest is a stream handle, just make this stream the current output. See the introduction of section 4.17.3 for details.