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PostgreSQL Connection String command line options

In the first format, each parameter setting is in the form keyword = value. Spaces around the equal sign are optional. To write an empty value, or a value containing spaces, surround it with single quotes, e.g., keyword = 'a value'. Single quotes and backslashes within the value must be escaped with a backslash, i.e., \' and \\.
Example:
host=localhost port=5432 dbname=mydb connect_timeout=10
The recognized parameter key words are listed in below link

Connection URIs

The general form for a connection URI is:
postgresql://[user[:password]@][netloc][:port][/dbname][?param1=value1&...]
The URI scheme designator can be either postgresql:// or postgres://. Each of the URI parts is optional. The following examples illustrate valid URI syntax uses:
postgresql://
postgresql://localhost
postgresql://localhost:5433
postgresql://localhost/mydb
postgresql://user@localhost
postgresql://user:secret@localhost
postgresql://other@localhost/otherdb?connect_timeout=10&application_name=myapp
Components of the hierarchical part of the URI can also be given as parameters. For example:
postgresql:///mydb?host=localhost&port=5433
Percent-encoding may be used to include symbols with special meaning in any of the URI parts.
Any connection parameters not corresponding to key words listed in  are ignored and a warning message about them is sent to stderr.
For improved compatibility with JDBC connection URIs, instances of parameter ssl=true are translated into sslmode=require.
The host part may be either host name or an IP address. To specify an IPv6 host address, enclose it in square brackets:
postgresql://[2001:db8::1234]/database
The host component is interpreted as described for the parameter host. In particular, a Unix-domain socket connection is chosen if the host part is either empty or starts with a slash, otherwise a TCP/IP connection is initiated. Note, however, that the slash is a reserved character in the hierarchical part of the URI. So, to specify a non-standard Unix-domain socket directory, either omit the host specification in the URI and specify the host as a parameter, or percent-encode the path in the host component of the URI:
postgresql:///dbname?host=/var/lib/postgresql
postgresql://%2Fvar%2Flib%2Fpostgresql/dbname

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