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ON

   Performs a specified action when a command or program executed
   within a command procedure encounters an error condition or
   is interrupted by Ctrl/Y. The specified actions are performed
   only if the command interpreter is enabled for error checking or
   Ctrl/Y interrupts (the default conditions). Use the ON command
   only in a command procedure.

   Format

     ON  condition THEN [$] command

Additional information available:

Parameters      Examples