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