How to tell if stdin/stdout is redirected?

[Ralf Brown]

In article <807 at tsdiag.ccur.com> jeffs at tsdiag.ccur.com (Jeff Schnell) writes:
}I would like to know if there is a way to tell if stdin/stdout
}is redirected.  I would like it in Turbo C and/or Microsoft C
}and also in unix.

	isatty(fileno(stdin))

works for me under Turbo C (returns nonzero iff stdin points at a character 
device such as CON, PRN, etc) and should work under Unix (since that is where
isatty originated).



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