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From: mpyoung@portia.Stanford.EDU (M. Pinghua Young)
Newsgroups: comp.unix.questions
Subject: How does a C program know its input is being redirected?
Keywords: input, stdin, redirect, pipe, C program
Message-ID: <1990Aug16.050013.21280@portia.Stanford.EDU>
Date: 16 Aug 90 05:00:13 GMT
Sender: mpyoung@portia.Stanford.EDU (M. Pinghua Young)
Distribution: usa
Organization: Graduate School of Business, Stanford University
Lines: 10

I am writing a program that prompts users for various inputs.  However,
the user can also put the input in a file and pipe it to my program, or
use input redirection "<".  In this case I don't want the program to
prompt anything.  Can anyone tell me how to achieve that?  Please send
me e-mails.  Thank!

-- 
|   M. Pinghua Young               |    Confucius Said:                 |
|   pinghua@suwatson.bitnet        |        "Life Begins at 30"         |
|   mpyoung@portia.stanford.edu    |               But He Died At 29.   |