doc/Commands: add example of nesting pipes and substitutions

doc/Commands.md

@@ -9,6 +9,7 @@
   * [Chaining](#chaining)
   * [Piping](#piping)
   * [Substitution](#substitution)
+  * [Nesting Pipes and Substitutions](#nesting-pipes-and-substitutions)
   * [Variables](#variables)
   * [Selectors](#selectors)
   * [Background processing](#background-processing)
@@ -295,6 +296,16 @@ factoid otherwise it will be expanded first.
     <pragma-> !img spaces & stuff
        <PBot> https://google.com/search?tbm=isch&q=spaces%20%26%20stuff
 
+### Nesting Pipes and Substitutions
+Both [Piping](#Piping) and [Substitutions](#Substitution) can be nested.
+
+For example:
+
+     <pragma-> !echo $randomnick's IQ is &{roll 1d50+70}
+        <PBot> mnrmnaugh's IQ is rolled 1d50+70 for 85.
+     <pragma-> !echo $randomnick's IQ is &{roll 1d50+70 | {sed s/rolled.*for //}}
+        <PBot> ntwk's IQ is 110.
+
 ### Variables
 You can use factoids as variables and interpolate them within commands.
 

doc/README.md

@@ -52,6 +52,7 @@
     * [Chaining](Commands.md#chaining)
     * [Piping](Commands.md#piping)
     * [Substitution](Commands.md#substitution)
+    * [Nesting Pipes and Substitutions](Commands.md#nesting-pipes-and-substitutions)
     * [Variables](Commands.md#variables)
     * [Selectors](Commands.md#selectors)
     * [Background processing](Commands.md#background-processing)
@@ -342,6 +343,7 @@
     * [Initial virtual machine set-up complete](VirtualMachine.md#initial-virtual-machine-set-up-complete)
   * [Start PBot VM Host](VirtualMachine.md#start-pbot-vm-host)
     * [Test PBot](VirtualMachine.md#test-pbot)
+  * [QEMU command from libvirt](VirtualMachine.md#qemu-command-from-libvirt)
 <!-- md-toc-end -->
 <!-- md-toc-begin -->
 * [Frequently Asked Questions](FAQ.md#frequently-asked-questions)