#include <unistd.h>
#include <string.h>

int
main(int argc, char *argv[])
{
    int fd[2];

    char *s = "ls -1 \"/usr/bin\" | while IFS= read -r fp\ndo\ncat <<- EOF\n\t$fp\nEOF\ndone;";
    //char *s = "ls -1";


    pipe(fd);

    switch(fork()) {
        case 0:
            close(fd[1]);
            dup2(fd[0], 0);
            execl("/bin/sh", "sh", NULL);
            close(fd[0]);
        break;
        default:
            close(fd[0]);
            write(fd[1], s, strlen(s) + 1);
            close(fd[1]);
        break;
    }

    return 0;
}