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chdir(2). See also
current-directory(See section 11.6.1 Directory utilities).
Buffering can be
and specifies the buffering mode of the ports opened on the pipe.
See section 6.18.3 File ports, for details of the buffering mode.
The default mode is sufficient for typical cases.
(receive (in out) (sys-pipe) (display "abc\n" out) (flush out) (read-line in)) => "abc"
Note: the returned value is changed from version 0.3.15, in which
sys-pipe returned a list of two ports.
#tif the port is connected to the console,
#fif the port is not connected to a terminal.