IFERROR - Test result code and conditionally branch to label

Syntax:	IFERRORxx	[ rcode ] goto [ label ]
Forms:	IFERROR	[ rcode ] goto [ label ]
	IFERROR=	[ rcode ] goto [ label ]
	IFERROR<	[ rcode ] goto [ label ]
	IFERROR>	[ rcode ] goto [ label ]
	IFERROR<=	[ rcode ] goto [ label ]
	IFERROR>=	[ rcode ] goto [ label ]
	IFERROR! =	[ rcode ] goto [ label ]
Arguments:	[ rcode ]	Optional numeric value or $ERROR variable associated with result codes returned by script commands upon completion; any successful operation returns a value of 0.
	[ label ]	A valid label within the current script file which is branched to if the conditional test is successful.
Options:	none

This script command checks the result of the previously executed command to see if IFERRORxx [ rcode ] is true. If so, the script file branches to [ label ], otherwise execution continues with the next command.

The [ rcode ] may be omitted if you do not wish to test for a specific error condition. A value of 1 is assumed, which results in testing for any error condition. The following variations of the IFERROR command are supported:

Syntactically, no space is permitted to the left of the ‘!’, '=', '<' or '>' symbols, and a space is required to the right of these symbols.