Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!usc!orion.oac.uci.edu!echarne
From: echarne@orion.oac.uci.edu (Eli B. Charne)
Newsgroups: comp.unix.questions
Subject: Re: How to find out if stdout is piped?
Message-ID: <25D902CF.20654@orion.oac.uci.edu>
Date: 14 Feb 90 07:03:43 GMT
References: <7638@tank.uchicago.edu>
Organization: University of California, Irvine
Lines: 21

phd_ivo@gsbacd.uchicago.edu writes:

>In Mach (a BSD 4.3 clone), is there an easy way to
>find out if stdout is hooked to a pipe, or redirected
>into a file?

  Yes.

  Use the library routine isatty()

     isatty(filedes)

     Isatty returns 1 if filedes is associated with a terminal
     device, 0 otherwise.

						     -Eli

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Eli B. Charne              INTERNET: echarne@ORION.OAC.UCI.EDU
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