On Sunday 19 September 2004 14:58, sigsegv@rambler.ru wrote:
> I have a silly question, looking at NetBSD source code, each file has a
> tag on the first line, like the one below
>
> $NetBSD: kern_lock.c,v 1.83 2004/08/04 10:37:08 yamt Exp $
>
> Could somebody please explain the format of those tags, i.e. why is
> there '$' at the start and end? What is 'Exp' for? What is 'yamt' for?

man co
/KEYWORD SUBSTITUTION