```
system("echo 'abcpasswd' | su - NewUsr -c 'ls -ltr'");

```

Above code embedded in my 'C' code which generats a binary , which is later called from a html page.
Now the above code prompts for a 'Password' which is piped in the command. But i end up seeing the prompt 'Password:' in my html rendered page.

How do i get around this ?. I don't want the prompt 'Password:' seen on my webpage.