<command name> is "set", "add", "replace", "append" or "prepend"

"set" means "store this data".

"add" means "store this data, but only if the server *doesn't* already
hold data for this key".

"replace" means "store this data, but only if the server *does*
already hold data for this key".

"append" means "add this data to an existing key after existing data".

"prepend" means "add this data to an existing key before existing data".

The append and prepend commands do not accept flags or exptime.
They update existing data portions, and ignore new flag and exptime
settings.

"cas" is a check and set operation which means "store this data but
only if no one else has updated since I last fetched it."

__________________
With,
J. Jeyaseelan
Everything Possible