Login using web service

curl -H "Content-Type: text/html" -D "cookies.txt"
"http://192.168.142.154/manager?
action=login&username=admin&secret=admin&format=json&jsoncallback=?"

curl -H "Content-Type: text/xml" --cookie "cookies.txt"
"http://192.168.142.154/manager?action=put&var-0000=Index&val-0000=2&var-
0001=Server&val-0001=abcd.com&var-0002=Activate&val-
0002=1&format=json&jsoncallback=?"