Path: utzoo!attcan!uunet!aplcen!samsung!usc!elroy.jpl.nasa.gov!ames!haven!udel!princeton!phoenix!subbarao
From: subbarao@phoenix.Princeton.EDU (Kartik Subbarao)
Newsgroups: comp.unix.questions
Subject: Re: Interfacing C Code to Shell Script
Keywords: popen
Message-ID: <16870@phoenix.Princeton.EDU>
Date: 30 May 90 18:06:37 GMT
References: <23487@adm.BRL.MIL>
Reply-To: subbarao@phoenix.Princeton.EDU (Kartik Subbarao)
Lines: 28

In article <23487@adm.BRL.MIL> rose@baby.swmed.utexas.edu (Rose Oguz) writes:
>	I want to call a shell script from my C program.  However, I 
>would like the script to return values to my C program.  Is there a

Okay gang, even though many "official" unix.hackers out there might disagree,
this one simply says that popen() is screaming for this job, just as it's
supposed to :-).

In your C shell script, do this:
#!/bin/csh
...
echo "(whatever the status you want to give to the c program)"

then -- in your C program do this:
FILE *cpipe = popen("name_of_cshell_script","r");
then just read from cpipe as if it were a file.
e.g, 
c = getc(cpipe); 
fgets(foo, 500, cpipe);
etc...


			-Kartik

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