Document Nmap option --noninteractive. See #1152

docs/nmap.usage.txt

@@ -95,6 +95,7 @@ OUTPUT:
   --iflist: Print host interfaces and routes (for debugging)
   --append-output: Append to rather than clobber specified output files
   --resume <filename>: Resume an aborted scan
+  --noninteractive: Disable runtime interactions via keyboard
   --stylesheet <path/URL>: XSL stylesheet to transform XML output to HTML
   --webxml: Reference stylesheet from Nmap.Org for more portable XML
   --no-stylesheet: Prevent associating of XSL stylesheet w/XML output

docs/refguide.xml

@@ -4120,6 +4120,23 @@ hosts with at least one
         </listitem>
       </varlistentry>
 
+      <varlistentry>
+        <term>
+          <option>--noninteractive</option> (Disable runtime interactions)
+          <indexterm><primary><option>--noninteractive</option></primary></indexterm>
+          <indexterm><primary>runtime interaction</primary><secondary>disabling</secondary></indexterm>
+        </term>
+        <listitem>
+
+          <para>At times, such as when running Nmap in a shell background,
+          it might be undesirable for Nmap to monitor and respond to user
+          keyboard input when running. (See
+          <xref linkend="man-runtime-interaction"/> about how to control
+          Nmap during a scan.) Use option <option>--noninteractive</option>
+          to prevent Nmap taking control of the terminal.</para>
+        </listitem>
+      </varlistentry>
+
       <varlistentry>
         <term>
           <option>--stylesheet <replaceable>path or URL</replaceable></option> (Set XSL stylesheet to transform XML output)

nmap.cc

@@ -291,6 +291,7 @@ static void printusage() {
          "  --iflist: Print host interfaces and routes (for debugging)\n"
          "  --append-output: Append to rather than clobber specified output files\n"
          "  --resume <filename>: Resume an aborted scan\n"
+         "  --noninteractive: Disable runtime interactions via keyboard\n"
          "  --stylesheet <path/URL>: XSL stylesheet to transform XML output to HTML\n"
          "  --webxml: Reference stylesheet from Nmap.Org for more portable XML\n"
          "  --no-stylesheet: Prevent associating of XSL stylesheet w/XML output\n"