coreutils/yes.c

   1 #include <stdio.h>
   2
   3 int main(int argc, char *argv[])
   4 {
   5     const char *str = argc > 1 ? argv[1] : "y";
   6     for (;;)
   7         if(puts(str) == EOF)
   8         {
   9             perror("yes");
  10             return 1;
  11         }
  12 }