command initdb not found

Hi ,
I have downloaded and installed cygwin as stated in
FAQ_CYGWIN for postgresql
I have followed the steps below

1. Download and run the Cygwin installer. Visit http://cygwin.com/ and
click on the "Install Cygwin now' link. This will prompt you
to download a "setup.exe". Save this file somewhere on your
system and then execute it.

2. Proceed through the Cygwin install wizard. Choose 'Install from
Internet', specify a Local Package Directory and choose a mirror
site that's close to you. Answer the other installer questions
appropriately for your configuration.

When you come to the point of choosing which packages to install,
expand the 'Database' section and click 'Skip' next to PostgreSQL
to change it to the latest version of PostgreSQL available for
Cygwin.

3. Once the download and install process is complete, open a Cygwin
shell and do the following for a basic installation:

3a. Start cygserver for shared memory support. To do this,
enter the command "/usr/sbin/cygserver &". This program
needs to be running anytime you start the PostgreSQL server
(postmaster) or initialize a database (initdb).

Result:
$ /usr/sbin/cygserver &
[1] 1320

3b. Use the initdb command to create a new database cluster. An
example command would be:

initdb -D /usr/local/pgsql/data -W -E SHIFT_JIS

BUT After passing initdb command the cywin is prompting a error

Result:
$ initdb -D /usr/local/pgsql/data -W -E SHIFT_JIS
bash: initdb: command not found

What could be the possible error?

Please help me install Postgresql on Windows 2000 (JP Version) SP4.

Thanks in advance
Maneesh
Japan