Thread: piping output input

  1. #1
    Registered User
    Join Date
    Jan 2010

    piping output input

    Essentially, I'm trying to pipe the output of a text file, lets call it test.txt, into my C program, lets call it program.

    I assume I would evoke this by typing "cat test.txt | ./program".

    In the actual code, I would handle it like any command line operation ( utilizing argc/argv ). Is this logic correct? I don't have to do any pipe programming do I?

    Unfortunately my logic doesn't follow as it's not working. Any advice is appreciated.

    here is the code i have written - its pretty simple.

    int main( int argc, char * argv[] )
            int i;
            printf("%d\n", argc);
            for(i=1; i < argc; i++)
            return 0;

  2. #2
    ATH0 quzah's Avatar
    Join Date
    Oct 2001
    You have to hope the shell you're running your program through doesn't parse your commands. You might type:

    ./foo < bar | baz

    But for command line arguments, foo might not get anything.

    Hope is the first step on the road to disappointment.

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