‘--pwfile’ command

Hello,
Could someone tell me if the ‘--pwfile’ command can be applied to createdb.exe and psql.exe?
I found a description of ‘--pwfile’ at http://www.it-manuals.info/postgressql/app-initdb.html, which states:
--pwfile=filename
makes initdb read the database superuser's password from a file. the first line of the file is taken as the password.
I would like to disable password prompt (-W) and have the password read from a file.
Any pointers would surely be appreciated.
Thanks,
Tommy_
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