.key src/a,dst/a
; cmove
; copy $1 to $2, if $1 exists
if exists <src>
;	echo "<src>-><dst>"
	copy <src> <dst> clone
else
	if not exists <dst>
		echo "CAUTION: <dst> DOES NOT EXIST!"
	else
		echo "Warning: no source for <dst>"
	endif
endif