3 files changed, 29 insertions, 0 deletions
diff --git a/.gitignore b/.gitignore
index 91a0115..7574d2c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,5 @@ tmp
 pkg
 node_modules
 .bundle
+shadow
+passwd
diff --git a/README.md b/README.md
index 84d10d8..c44bff9 100644
--- a/README.md
+++ b/README.md
@@ -1161,3 +1161,18 @@ Rootly Powers and Processes
     ```
 
   e. Find entries that have no expiration date (needs /etc/shadow).
+
+    ```bash
+    #!/bin/bash
+
+    cd "..$(dirname $PWD)"
+
+    for i in `cat /etc/shadow`; do
+      login=$(echo $i | cut -d: -f1)
+      expiration=$(echo $i | cut -d: -f8)
+
+      if [ -z "$expiration" ]; then
+        echo $login: does not have an expiration date
+      fi
+    done
+    ```
diff --git a/bin/missing-expiration-date b/bin/missing-expiration-date
new file mode 100755
index 0000000..8a0c7fe
--- /dev/null
+++ b/bin/missing-expiration-date
@@ -0,0 +1,12 @@
+#!/bin/bash
+
+cd "..$(dirname $PWD)"
+
+for i in `cat /etc/shadow`; do
+  login=$(echo $i | cut -d: -f1)
+  expiration=$(echo $i | cut -d: -f8)
+
+  if [ -z "$expiration" ]; then
+    echo $login: does not have an expiration date
+  fi
+done