From a89061ab6bdc2a6941aae2745b58f4f0482e1498 Mon Sep 17 00:00:00 2001
From: mo khan <mo.khan@gmail.com>
Date: Tue, 1 Oct 2019 19:19:43 -0600
Subject: Detect OS to use proper grep options

---
 README.md    | 8 ++++++--
 bin/uid-zero | 8 ++++++--
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/README.md b/README.md
index 13c1fe5..d6fbbf0 100644
--- a/README.md
+++ b/README.md
@@ -1129,9 +1129,13 @@ Rootly Powers and Processes
   a. Find entries that have UID 0.
 
     ```bash
-    #!/bin/sh
+    #!/bin/bash
 
-    cat /etc/passwd | grep -P '^\w+:[x]:\d+:0.*$'
+    if [[ "$OSTYPE" == "darwin"* ]]; then
+      cat /etc/passwd | cut -d: -f1,3 | grep ':0'
+    else
+      cat /etc/passwd | grep -P '^\w+:[x]:\d+:0.*$'
+    fi
     ```
 
   b. Find entries that have that have no password (needs /etc/shadow).
diff --git a/bin/uid-zero b/bin/uid-zero
index 129d587..2976cbb 100755
--- a/bin/uid-zero
+++ b/bin/uid-zero
@@ -1,3 +1,7 @@
-#!/bin/sh
+#!/bin/bash
 
-cat /etc/passwd | grep -P '^\w+:[x]:\d+:0.*$'
+if [[ "$OSTYPE" == "darwin"* ]]; then
+  cat /etc/passwd | cut -d: -f1,3 | grep ':0'
+else
+  cat /etc/passwd | grep -P '^\w+:[x]:\d+:0.*$'
+fi
-- 
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