# linux
PGPASSWORD="password" pg_dump -h host -p port -U username database > file.sql

# windows (NO SPACE between 'password' and '&&')
SET PGPASSWORD=password&& pg_dump -h host -p port -U username database > file.sql

# alternative
pg_dump --dbname=postgresql://username:password@host:port/database > file.sql

# restore
psql -U postgres database < file.sql