From b31c6dc059ee4857117c1ce34942b162c08f12a4 Mon Sep 17 00:00:00 2001
From: Pete Doherty <pdoherty+github@protonmail.com>
Date: Mon, 5 Feb 2024 13:45:23 -0500
Subject: [PATCH] Add basic input validation to `select` example

Report an error message and exit early from select example if input is invalid.
---
 README.md | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/README.md b/README.md
index 1f3a96f..62ba88e 100644
--- a/README.md
+++ b/README.md
@@ -780,6 +780,12 @@ A working example might look like this:
 PS3="Choose the package manager: "
 select ITEM in bower npm gem pip
 do
+  # exit early if selection is invalid
+  if [[ -z "$ITEM" ]]; then
+      >&2 echo "Invalid selection"
+      exit 1
+  fi
+
   echo -n "Enter the package name: " && read PACKAGE
   case $ITEM in
     bower) bower install $PACKAGE ;;