problem with Quick Start

I've worked through almost all of the Quick Start in the Introduction
of the Book*, but now I'm stuck on page 7.
I have a (local) repository in /path/to/repos, and a working copy of
my project in /tmp/myproject:
/tmp/myproject/trunk:
Makefile bar.c foo.c
I'm not sure what the book means by "Enter your working copy", but I
cd'd to the directory /tmp/myproject/trunk),
edited foo.c using emacs, then tried to run svn diff (with my working
directory being /tmp/myproject/trunk) --
but I get the error message:

        svn: '.' is not a working copy

What's wrong? What do I do now?

I'm operating on an Apple PowerBook G4 running Mac OS X (version
10.4.7);
I have a rough (VERY rough) ability to use the command line interface
using Terminal;
I have an incompetent sysadmin (myself);
I've installed subversion v1.3, apparently successfully.

--Roland Silver <rollos@kitcarson.net>

* The "Book" is:
        Version Control with Subversion
        For Subversion 1.3
        (book compiled from Revision 2354)

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Received on Wed Aug 2 14:48:40 2006