Dropping tables in a PostgreSQL database by table owner

psql_drop_tables_by_user.sh

# first, login with psql
psql -U user_name -W -d database_name -h ip_address

# set output for all queries
\o file_name.sql

# run this query
select 'drop table if exist "'|| tablename ||'" cascade;' from pg_tables where tableowner='user_name' and schemaname='public';

# logout from psql
\q

# run sql script from commandline
psql -U user_name -W -d database_name -f file_name.sql