Create script for detecting duplicate login names

1 files changed, 17 insertions, 2 deletions

diff --git a/README.md b/README.md
index bbc7e94..1adf5c9 100644
--- a/README.md
+++ b/README.md
@@ -1171,6 +1171,7 @@ Rootly Powers and Processes
     ```bash
     #!/bin/bash
 
+    cd "$(dirname "$0")/.."
     FILE=${1:-'/etc/passwd'}
 
     cat "$FILE" | cut -d: -f1,3 | grep ':0'
@@ -1181,9 +1182,10 @@ Rootly Powers and Processes
     ```bash
     #!/bin/bash
 
+    cd "$(dirname "$0")/.."
     FILE=${1:-'/etc/passwd'}
 
-    grep -E '^\w+::.*' $FILE
+    grep -E '^\w+::.*' "$FILE"
     ```
 
   c. Find any sets of entries that have duplicate UIDs.
@@ -1191,7 +1193,20 @@ Rootly Powers and Processes
     ```bash
     #!/bin/bash
 
-    cat /etc/passwd | grep -v -E '^#' | awk -F: '{ print $3 }' | sort -n | uniq -d
+    cd "$(dirname "$0")/.."
+    FILE=${1:-'/etc/passwd'}
+
+    ids=$(grep -v -E '^#' "$FILE" | awk -F: '{ print $3 }' | sort -n | uniq -d)
+
+    for id in $ids; do
+      grep -v -E '^#' "$FILE" | awk -F: '{ print $3 " " $1 }' | grep -E "^$id "
+    done
+
+    if [ -z "$ids" ]; then
+      exit 0
+    else
+      exit 1
+    fi
     ```
 
   d. Find entries that have duplicate login names.