Inserting file content into column

Hello,

Is there a built-in function that reads the contents of a (textual) file which could then be inserted into a given (varchar) column. What I am after is something like:

insert into cert ( cert_id,...., x509_data ) values ( nextval('seq_cert'), ...., load_file('./ca/mycert.pem') );

I need to do that from a DB init SQL script rather then from an application.

Thanks you,
Jan Moravec