psql prompting for password. Can we suppress it?

Hello,
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We are trying to perform bulk insert into PostGre database with the help of
a text file (containing n INSERT statements), and then invoking psql command
from a batch file.
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"psql -d  -f  -h  -U "
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The issue is that the psql command window prompts for the password. Have you
got any idea how to suppress it?=20
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Thanks in advance.
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Best Regards,
Pradeep Rai
(New Delhi, India)