From 8ef0dc0dcc2bcc3ae5dfdf1deb284a87af669ec5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alejandro=20Gonz=C3=A1lez?=
 <AlexTMjugador@users.noreply.github.com>
Date: Wed, 13 Apr 2022 21:47:22 +0200
Subject: [PATCH] Make explanation on how to fix this check on sh clearer, add
 example of heredoc

---
 SC2031.md | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/SC2031.md b/SC2031.md
index 50c28cf..218bfe7 100644
--- a/SC2031.md
+++ b/SC2031.md
@@ -18,7 +18,15 @@ n=0
 while read i; do (( n+=i )); done < <(printf "%s\n" {1..10})
 echo $n
 ```
-In `sh`, a temp file (better if fifo or fd) can be used instead of process substitution. And if it's acceptable to do it with waiting, try Here Documents.
+In `sh`, temporary files, FIFOs or file descriptors can be used instead. When the output of the command can be stored to a variable before entering the loop, here documents are a preferable alternative:
+```sh
+n=0
+SUMMANDS="$(printf '%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n' 1 2 3 4 5 6 7 8 9 10)"
+while read i; do n=$(( n + i )); done <<SUMMANDS_INPUT
+$SUMMANDS
+SUMMANDS_INPUT
+echo $n
+```
 
 
 With Bash 4.2+ you can also use `shopt -s lastpipe` which will change the pipe behaviour to be similar to Ksh and Zsh (see Rationale below) [as long as job control is not active](https://www.gnu.org/software/bash/manual/html_node/The-Shopt-Builtin.html) (e.g. inside a script):