iraf.net

NUMBER:	152
MODULE:	images.imshift
SYSTEM:	V2.9
DATE:	Mon Jul 29 11:42:28 MST 1991
FROM:	davis

BUG:	Imshift was not correctly initializing the shifts file descriptor to
	NULL, when the shifts_file parameter was set to '', sometimes causing
	a later conditional test in the code to fail.

	This bug is triggered when a user sets shifts_file to a file name
	and then sets it back to '' without flushing the process cache,
	as may happen after repeated executions in a script.

STATUS:	The bug has been fixed in 2.10. There is no workaround except to
	flush the process cache between executions.