Project 1 audit user

week 1/projects/User audit Script/correction.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+
+# userAudit: print invalid usernames
+#! Safe iteration over /etc/passwd using while read -r
+
+awk -F ":" '{print $1}' /etc/passwd | while read -r username; do
+    firstChar="${username:0:1}"
+    badChar=false
+
+    # Check if username contains only letters
+    for ((i=0; i<${#username}; i++)); do
+        char="${username:i:1}"
+        if ! [[ "$char" =~ [A-Za-z] ]]; then
+            badChar=true
+            break
+        fi
+    done
+
+    # Flag invalid usernames
+#! Corrected logic to properly flag invalid usernames:
+#! check if the firstchar is NOT a letter
+    if (( ${#username} > 20 )) || ! [[ "$firstChar" =~ [A-Za-z] ]] || $badChar ; then
+#! Quotes around $username in echo for robustness.
+        echo "$username"
+    fi
+done