Sending errors from psql to error file

Hello,

I am trying to migrate a client from one database to another. Basically
we designed a web application for them using Postgresql but we have made
many changes to the design of our application since version 1. Now they
want to upgrade. So basically I have to pg_dump their current data and
then import it into our new schema. Now, of course I realize that there
are going to be errors. But they have a lot and I mean a lot of data.
I don't want to have to sit there and watch the import go by, I want to
run a command and then look in a file for any errors after the import is
complete. I tried this command but it didn't work:
gunzip -c cli_postDataInserts.sql.gz | psql cli_post -U system | grep
"ERROR:*" > import_errors

Any help is appreciated.

Thanks.

--
Devin Whalen
Programmer
Synaptic Vision Inc
Phone-(416) 539-0801
Fax- (416) 539-8280
1179A King St. West
Toronto, Ontario
Suite 309 M6K 3C5
Home-(416) 653-3982