pipe

#include <stdio.h>

#define MAX 10000
int main(int argc, char** argv)
{
    FILE* pinp = popen(argv[1], "r");
    FILE* pout = popen(argv[2], "w");
    char buffer[MAX];
    while(1)
    {
        if(fgets(buffer, MAX, pinp) == NULL)
            break;
        fputs(buffer, pout);
    }
    pclose(pinp);
    pclose(pout);
}