diff --git a/random-bash.md b/random-bash.md
old mode 100644
new mode 100755
index ce4ea8a..344e402
--- a/random-bash.md
+++ b/random-bash.md
@@ -49,9 +49,18 @@ echo "Package manager: ${PM}"
 This exits with and error message if it's run as root.
 
 ```bash
-#!/bin/bash
+#!/usr/bin/env bash
 if [ $(whoami) != "root" ]; then
     >&2 echo Rerun as non-root user
     exit 1
 fi
+```
+
+## Output to stderr
+
+```bash
+#!/usr/bin/env bash
+# Put `>&2` at beginning or end of line to output to stderr
+>&2 echo "This goes to stderr"
+echo "This goes to stdout"
 ```
\ No newline at end of file
diff --git a/test.bash b/test.bash
index 46361b3..88aa31f 100755
--- a/test.bash
+++ b/test.bash
@@ -1,5 +1,5 @@
-#!/bin/bash
-command_exists() { type "$1" &> /dev/null; }
+#!/usr/bin/env bash
+type "$1" &> /dev/null; }
 
 if command_exists "apt-get"; then
     PM="apt-get"