Use .pgpass the password file postgresql

pgpass password file is used when connecting postgresql, the normal position of ~ / .pgpass.
Really use some components must be used Shihai. Specific format:

hostname:port:database:username:password

Common usage is as follows:

# su - postgres
$ vi ~/.pgpass
#hostname:port:database:username:password
192.168.0.102:5432:postgres:postgres:rootroot

~ Permissions on .pgpass / 600 must be

$ chmod 0600 ~/.pgpass