Optional blockingOptional dataUsed for "database" commands to enforce type checking.
Private loggerMaximum number of parameters allowed. -1 for no maximum.
Minimum number of parameters require.
Optional pubUsed when PUB/SUB is in effect.
Optional signSign is used in commands with a compliment command. The only current example is INCR/DECR. Sign is 1 for INCR and -1 for DECR
Optional txUsed in transactions to enqueue a command.
Every command must implement the execute method.
Available since 1.0.0.
LSET key index element
Sets the list element at index to element. For more information on the index argument, see LINDEX.
unit-redisness-test follows the observed behavior of Redis - if the key does not exist then we return 'ERR no such key'
An error is returned for out of range indexes.
###Return value Simple string reply