psql -U postgres -h localhost -p 5432 -f data_dump.sql
psql -U username -d dbname < filename.sql
#To dump a database called mydb into a SQL-script file:
pg_dump mydb > db.sql
#To reload such a script into a (freshly created) database named newdb:
psql -d newdb -f db.sql
pg_restore -U sam -d SamDataBase -1 SamDataBaseBackup.sql