Oracle SQL Developer Command-Line (SQLcl) help

Usage 1: sql -H | -V

    -H		   Displays the SQLcl version and the
		   usage help.
    -V		   Displays the SQLcl version.

Usage 2: sql  [<option>] [{ <logon> | /nolog}] [<start>] 

  <option> is:  [-R <level>] [-S] [-verbose] [-oci] [-L[OGON] ] [-cloudconfig <.zip> [-proxy <proxy>]]

    -R <level>	Sets restricted mode to disable SQLcl commands
                that interact with the file system.	The level can
                be 1, 2, 3 or 4.  The most restrictive is -R 4 which
                disables all user commands interacting with the
                file system.
    -S	        Sets silent mode which suppresses the display of
                the SQLcl banner, prompts, and echoing of
                commands.
    -verbose    Set this to show logging messages inline.
                By default these messages are suppressed.
    -nohistory  Switch off history logging.
    -noupdates  Do not check update site for newer versions available.
    -oci        Set this to use an Oracle Instant Client installation.
                If this option is set, then SQLcl will use the drivers
                from the first Installation on the path.
    -L[OGON]    Specifies not to reprompt for username or password 
                if the initial connection does not succeed.
    -cloudconfig <file.zip> [-proxy <proxy>]
                Use file.zip to connect to cloud - with optional proxy.

  <logon> is: {<username>[/<password>][@<connect_identifier>] | / }
	      [AS {SYSDBA | SYSOPER | SYSASM}] 

    Specifies the database account username, password and connect
    identifier for the database connection.  Without a connect
    identifier, SQLcl connects to the default database.

    The AS SYSDBA, AS SYSOPER and AS SYSASM  options are database
    administration privileges.

    <connect_identifier> can be in the form of Net Service Name
    or Easy Connect.

      @[<net_service_name> | [//]Host[:Port]/<service_name>]

	<net_service_name> is a simple name for a service that resolves
	to a connect descriptor.

	Example: Connect to database using Net Service Name and the
		 database net service name is ORCL.

	   sql myusername/mypassword@ORCL

	Host specifies the host name or IP address of the database
	server computer.

	Port specifies the listening port on the database server.

	<service_name> specifies the service name of the database you
	want to access.

	Example: Connect to database using Easy Connect and the
		 Service name is ORCL.

	   sql myusername/mypassword@Host/ORCL

    The /NOLOG option starts SQLcl without connecting to a
    database.


  <start> is: @<URL>|<filename>[.<ext>] [<parameter> ...]

    Runs the specified SQLcl script from a web server (URL) or the
    local file system (filename.ext) with specified parameters that
    will be assigned to substitution variables in the script.

When SQLcl starts, and after CONNECT commands, the site profile
(e.g. $ORACLE_HOME/sqlplus/admin/glogin.sql) and the user profile
(e.g. login.sql in the working directory) are run.  The files may
contain SQLcl commands.

Refer to the SQLDeveloper User's Guide and Reference for more information.