Take the dump of Postgresql database from Linux console

*To dump data or structure in the database from a dump file

$psql -u DBUserName datbaseName < databaseName_dump.sql

*To take the dump from the database

$pg_dump -u databaseName > filename.sql // data + structure
It will ask the username and password of database

$pg_dump -u databaseName -a > filename.sql // only data

$pg_dump -u databaseName -s > filename.sql // only structure

$pg_dump –username=sql-ledger -W databaseName > filename.sql
It will ask the password of database