Updated Template (markdown)

Template.md

@@ -1,17 +1,43 @@
-## (Message goes here)
+## Remove '$' or use '_=$((expr))' to avoid executing output.
 
 ### Problematic code:
 
-    (Simple example of problematic code)
+    i=4
+    $(( i++ ))
 
 ### Correct code:
 
-    (Simple example of above code, only fixed)
+Bash, Ksh:
+
+    i=4
+    (( i++ ))
+
+POSIX (assuming `++` is supported):
+
+    i=4
+    _=$(( i++ ))
+
+Alternative POSIX version that does not preserve the exit code:
+
+    : $(( i++ ))
 
 ### Rationale:
 
-(An explanation of why the code is problematic and how the correct code is an improvement)
+`$((..))` expands to a number. If it's the only word on the line, the shell will try to execute this number as a command name:
+
+    $ i=4
+    $ $(( i++ ))
+    4: command not found
+    $ echo $i
+    5
+
+To avoid trying to execute the number as a command name, use one of the methods mentioned:
+
+    $ i=4
+    $ _=$(( i++ ))
+    $ echo $i
+    5
 
 ### Exceptions:
 
-(Cases where the user may choose to ignore this warning, if any.)
+None.