Update app.py

app.py

@@ -6,7 +6,7 @@ def greet(command):
     commandList = command.split(' ')
     if(commandList[0] == "cd"):
         os.chdir(commandList[1])
-        output = subprocess.run([pwd], stdout=subprocess.PIPE).stdout.decode('utf-8')
+        output = subprocess.run(['pwd'], stdout=subprocess.PIPE).stdout.decode('utf-8')
         return f"{command}: \n {output}"
     else:
         output = subprocess.run(commandList, stdout=subprocess.PIPE).stdout.decode('utf-8')