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process pipes

From: tuna
Subject: process pipes
Date: Thu, 30 Apr 2009 17:55:43 PDT

Hello, what is the treatment of processes using esyscmd in m4?
what becomes of stdin and the other file descriptors when a
process is invoked from within m4?

In what way might the output of a shell program be piped into an
m4 script so that it may be used as a filter program?

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