Add sysupdate(8), no man page yet.

diff --git a/rc/bin/sysupdate b/rc/bin/sysupdate
new file mode 100755 (executable)
index 0000000..6d01ed0
--- /dev/null
+++ b/rc/bin/sysupdate
@@ -0,0 +1,4 @@
+#!/bin/rc
+
+bind -ac /dist/plan9front /
+hg pull && hg update