Project 1 audit user

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

@@ -0,0 +1,29 @@
+#!/bin/bash
+
+# userAudit
+
+#Read the passwd file for all the username
+file=$(awk -F ":" '{print $1}' /etc/passwd)
+
+for username in $file; do
+    firstChar="${username:0:1}"
+    badChar=false
+
+#check if the username contain only letters
+    for ((i=0; i<${#username}; i++)); do
+        char="${username:i:1}"
+        if ! [[ "$char" =~ [A-Za-z] ]]; then
+            badChar=true
+            break
+        fi
+    done
+
+#if the username is not valid
+# longer than 20 characters, start with not a letter and contain other char than letter
+# print it
+    if  ((${#username} >= 20)) || ! [[ "$firstChar" =~ [A-Za-z] ]] || $badChar ; then
+        echo $username
+    fi
+done
+
+