The syntax for invoking SQL*Plus from a command-line prompt is:
sqlplus [username
[/password
]][@hostname
] [@script
] [parm1
] [parm2
] ...
The Oracle username for the account to be connected.
The password for the username. If the password is omitted, SQL*Plus prompts for the password.
The hostname assigned to the database being connected to, as contained in the tnsnames.ora file or Oracle Names.
The name of a SQL script to be executed upon successful connection to the database.
Optional parameters that are passed to SQL*Plus and may be used as substitution variables within a SQL*Plus script. String parameters containing spaces or special characters must be enclosed in single quotes.
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