popen_example.c

#include <stdio.h>
#include <unistd.h>

int main(int argc, char* argv[])
{
    FILE * fp;
    char buffer[0x100];
    fp=popen(argv[1],"r");
    int counter = 1;
    while(counter){
        counter = fread(buffer, 1, sizeof(buffer), fp);
        write(1, buffer, counter);
    }
    pclose(fp);
}