add basic user functions to get id name and to do basic checks is_uer is_user_group is_user_sudo

modules/utility/user.lib

@@ -1,8 +1,27 @@
 #!/bin/bash
 
-is_user () {
+user_id () {
     local id;local user
-    echo -n $(id -u $1 2> /dev/null)
+    echo -n $(id -u ${1:-$USER} 2> /dev/null)
+}
+
+user_name () {
+    echo -n $(id -un -- ${1:-$USER} 2> /dev/null)
+}
+
+is_user () {
+  user_id $1
+}
+
+#group name plus optional username or id
+is_user_group () {
+    # echo id -nG ${2:-$USER} 
+    # id -nG ${2:-$USER} | grep -w "sudo"
+    if id -nG ${2:-$USER} | grep -qw "$1"; then echo ${2:-$USER} in $1; fi
+}
+
+is_user_sudo () {
+ is_user_group sudo $1
 }
 
 user_group_add() {