+echo >&2 "Creating main archive"
+tar -c -v --listed-incremental=tart.incr1 -f archive.1 tart 2> err || exit 1
+
+# The above prints two lines to stderr announcing the new directories c0 and c1.
+# Ensure that they appear in this script's stderr in sorted order.
+sort err 1>&2; rm -f err