Drop Schema from Postgres

Hi,
I am trying to execute a few postgres commands from a bash file

I am trying to drop a schema by writing the following line

DROP SCHEMA "xxx" IF EXISTS

I have two issues here -
1> I am not sure how to specify the db from which the schema should be
deleted
2> I am getting the following error message  -- "DROP: command not found"

Can anyone help me with this issue

Thanku in advance


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