add root function to lib

lib.sh

@@ -14,6 +14,35 @@ WANIP4=$(curl -s -k -m 5 -4 https://api64.ipify.org)
 
 ############ Functions
 
+is_root() {
+    if [[ "$EUID" -ne 0 ]]
+    then
+        return 1
+    else
+        return 0
+    fi
+}
+
+root_check() {
+if ! is_root
+then
+    msg_box "Sorry, you are not root. You now have two options:
+
+1. Use SUDO directly:
+   a) :~$ sudo bash name-of-script.sh
+
+2. Become ROOT and then type your command:
+   a) :~$ sudo -i
+   b) :~# bash name-of-script.sh
+
+In both cases above you can leave out $SCRIPTS/ if the script
+is directly in your PATH.
+
+More information can be found here: https://unix.stackexchange.com/a/3064"
+    exit 1
+fi
+}
+
 print_text_in_color() {
 printf "%b%s%b\n" "$1" "$2" "$Color_Off"
 }