By using add command, you can add value in the key.
Syntax :
add key flags exptime bytes [noreply]
value ?
Example : In the given example, we use "key" as the key and add the value Memcached in it with 900 seconds expiration time.
add key 0 900 9
memcached
STORED
get key
VALUE key 0 9
Memcached
END ?