/* pipein.c */
#include <stdio.h>

int main(int argc,char *argv[])
{
    FILE *pd;
    char instring[100];

    if((pd = popen("ls\n","r")) == NULL) {
        perror("Cannot open pipe");
        exit(1);
    }
    while(fgets(instring,sizeof(instring),pd) != NULL) {
        printf("                %s",instring);
    }
    pclose(pd);
    exit(0);
}