Errors apply to all system commands.
These errors effect the commands' input format.
If an error is found, the command is not carried out.
The command level of the terminal remains the same and an error message is printed
(5) The command level prompt sequence paragraph e below is issued.
(6) The following error messages apply to the System Commands:
Error message number 2 (Message Not Found) is printed if the requested message is
not located in message memory.
Error message number 10 (Invalid or Missing Operand) is issued when an incorrect or
incomplete operand is entered.
Error message number 12 (No Such Command) prints out when a nonexistent or
totally invalid command is issued.
Error message number 13 (Command Not Valid) prints out when the system is at the
wrong command level.
The system accepts either upper or lower case letters.
Checks commands for validity when the operator executes a CR.
System looks at command and attempts to identify it.
If the system fails, error message number 12 or 13 is printed.
Example: The terminal is operating in the EDIT command level and the operator wishes
to input the DOWN subcommand.
If the operator inputs a space, a "D" and a CR, the system would recognize it as an
invalid input because the EDIT subcommands DELETE and DOWN both begin with the
Operator would refer to table 2-9, "Subcommands of EDIT Command"to determine
that the shortest acceptable form for the DOWN subcommand is DO.
Operator then enters a space, DO and CR.
System recognizes the subcommand being input as DOWN and prepares to carry out
the subcommand. Thus, the input required for the command is only that portion of the
command needed for the system to determine which is being input. Examples: DE for
DELETE and DO for DOWN.
(6) Refer to tables 2-7, 2-8 and 2-9 for the shortest acceptable form for SYSTEM
commands and subcommands of the PARAMETER and EDIT commands.