--- a/stat.rst	Fri Feb 19 23:34:15 2016 +0200
+++ b/stat.rst	Sat Feb 20 01:59:00 2016 +0200
@@ -273,6 +273,12 @@
 
 and add colums TODO.
 
+Storage IO consumption.
+=======================
+::
+
+  $ iostat
+
 Power usage.
 ============
 ::
@@ -331,6 +337,10 @@
 
   $ nmap $IP
 
+Here ``-z`` means to scan for port range by waiting no longer then ``-w``::
+
+  $ nc -V -w 2 -z $IP 21-23
+
 Open ports on current host::
 
   $ netstat -i