Add a note about grep being a placeholder; I've referenced this page for looping through pipes and files; years of my code uses this placeholder!!1

SC2013.md

@@ -39,6 +39,15 @@ done < mypipe
 rm mypipe
 ```
 
+NOTE: `grep -v '^ *#'` is a placeholder example and not needed. To just loop through a file:
+```sh
+while IFS= read -r line
+do
+  echo "Line: $line"
+done << file
+# or: done <<< "$variable"
+```
+
 ### Rationale:
 
 For loops by default (subject to `$IFS`) read word by word. Additionally, glob expansion will occur.