Command and option structure and validation

SCO Visual Tcl commands are of the form:

Command [handle] [ -option [ optionArgs ...] ...]

where:

• Command begins with the sequence 'Vt' or 'Vx'.

• handle is the name or handle for some object that the server or interpreter can manipulate.

• option is one of the list of valid options within SCO Visual Tcl.

• optionArgs is one or more arguments specific to the specified option.

Invocation of non-existent commands is handled using the normal Tcl command mechanism (the unknown(TCL) procedure). If it fails, the command generates a Tcl error.

Options for each command are validated by the command. When commands are sent to the server for execution, the interpreter validates the options and breaks the command-option-arguments string into a data structure for transfer to the server. The server performs fine-grained option validation and handling.

See also:

• ``Command options by class''

• ``SCO Visual Tcl interpreter errors''

• ``(VTCL) commands by type''