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(guile.info)Writing

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Writing
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[Generic procedures for writing to ports.]

 - primitive: get-print-state port

 - primitive: newline [port]
     Send a newline to PORT.

 - primitive: port-with-print-state port pstate

 - primitive: print-options-interface [setting]

 - primitive: simple-format destination message . args
     Write MESSAGE to DESTINATION, defaulting to `current-output-port'.
     MESSAGE can contain ~A (was %s) and ~S (was %S) escapes.  When
     printed, the escapes are replaced with corresponding members of
     ARGS: ~A formats using `display' and ~S formats using `write'.  If
     DESTINATION is #t, then use the `current-output-port', if
     DESTINATION is #f, then return a string containing the formatted
     text.  Does not add a trailing newline.

 - primitive: write-char chr [port]
     Send character CHR to PORT.

 - primitive: force-output [port]
     Flush the specified output port, or the current output port if PORT
     is omitted.  The current output buffer contents are passed to the
     underlying port implementation (e.g., in the case of fports, the
     data will be written to the file and the output buffer will be
     cleared.)  It has no effect on an unbuffered port.

     The return value is unspecified.

 - primitive: flush-all-ports
     Equivalent to calling `force-output' on all open output ports.
     The return value is unspecified.