diff --git a/update_vlans_on_switch.py b/update_vlans_on_switch.py
index 8436c25..19e2e34 100755
--- a/update_vlans_on_switch.py
+++ b/update_vlans_on_switch.py
@@ -3,8 +3,12 @@ import requests
 import json
 import urllib3
 import ast
+from ipaddress import IPv4Interface
+import subprocess
+import sys
 
 urllib3.disable_warnings()
+
 API_TOKEN = 'Token 5ea2e025d89ea31674598ceb137c435a2a75c6e4'
 API_HOST = "https://demo.netbox.dev/"
 API_APP = "api/dcim/interfaces/"
@@ -16,13 +20,33 @@ headers = {
     'accept': 'application/json'
 }
 
-device_id = (input('Input switch ID:\n'))
+
+if len(sys.argv) > 1:
+    device_id = sys.argv[1]
+else:
+    device_id = (input('Input switch ID:\n'))
+
+DEVICE_IP = IPv4Interface((requests.get(API_HOST + 'api/dcim/devices/' + device_id, headers=headers,
+                                        verify=False).json()['primary_ip']['address']))
+
+# get vlan info and write to file
+cmd = ['./get_vlan.sh', str(DEVICE_IP.ip)]
+run = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, universal_newlines=True)
+out, err = run.communicate()
+
+if run.returncode != 0:
+    raise SystemExit(err)
+
+with open('vlanlist.json', 'w') as out_file:
+    out_file.write(out)
+# get vlan info and write to file
 
 vlan_database = {
     100: 1,
     300: 27,
     200: 2
 }
+
 vlan_from_switch = []
 
 with open('vlanlist.json') as f: