createdb.exe and psql.exe without Promting Password

Hi.

I would like to create an script that includes calls to createdb.exe and
psql.exe. I would like to use them with a user but without asking or
prompting for pasword. For example:
 createdb.exe -T template0 -U MyPosgresUser MyDataBaseName.

I've read that if I define an environment variable like SET
PGPPASSWORD=MyPosgresUserPassword, both calls dont ask for password. I've
tested this variable in different platforms and does not work.
Do you know how so solve it?

Thanks in advance!!
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