New option -compare

libisoburn/trunk/xorriso/xorriso.1

@@ -1249,6 +1249,17 @@ This is subject to the settings of -follow.
 -findx accepts the -exec actions as does -find. But it will
 always perform action "echo".
 .TP
+\fB\-compare\fR disk_path iso_rr_path
+Compare attributes and eventual data file content of a fileobject in the
+local filesystem with a file object in the ISO image. That iso_rr_path may
+well point to a image file object which is not yet committed, i.e. of which
+the data content still resides in the local filesystem. Such data content is
+prone to externally caused changes.
+.br
+Differing attributes are reported in detail, differing content is summarized.
+Both to the result channel. In case of no differences no result lines are
+emitted.
+.TP
 .B Command compatibility emulations:
 .PP
 Writing of ISO 9660 on CD is traditionally done by program mkisofs