Change user with the su command

[Fabio Di Fabio <difabio at tiscalinet dot it>]

Hi,

after 5 years of Linux, now I'm installing open sorce tools to W2000 for 
web development, in particular the last tool I've installed is the 
PostgreSQL database, now it's running, I've some problem in understand the 
user management under cygwin, I work usually as administrator, which is 
like the root and unix, but for example I've created an user in w2000 
called postgres which manage the database, but now I don't know how to 
switch from administrator to postgres user without relogin in w2000, I've 
seen that the su command is here but it doesn't work like the linux su, 
because if from the administrator shell I excute "su postgres" I got this 
output:

	su: cannot set user id: Not owner

I've search for documentation and in the archive of the mailing lists but I 
can't find something usefull, any help?

thanks,
	Fabio,


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