* Siju George:

> see the prompt starts with a '
>
>==================
> 'vtcdc: {1} whoami
> Unmatched '.
>================
>
> what happened here really?

My two cents:

You hit both the enter key as well as the ' key at the same time. The 
enter key won the contest (ending the conversation with su), but the ' got
through *before* the shell had a chance to print out the prompt. However, the
shell will still read it from stdin, so you didn't enter 

whoami<enter>

but instead, you really entered

'whoami<enter>

which would explain both the ' in front of the prompt, as well as the 
"unmatched '." error.

-- 
Martijn van Buul - pino@dohd.org