call-with-input-pipe[procedure] call-with-input-pipe cmdline proc [mode]
[procedure] call-with-output-pipe cmdline proc [mode]
Chicken: see also open-input-pipe, open-output-pipe,
with-input-from-pipe, with-output-to-pipe.
Some implementations allow to use "| cmdline" or "cmdline |" as
the filename in call-with-input-file and call-with-output-file
to achieve the same effects as these.
Gauche has call-with-input-process? and call-with-output-process?
which do the same thing.
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