AUTH password
Authenticate to the server
More: http://redis.io/commands/auth, http://www.redis.cn/commands/auth.html
ECHO message
Echo the given string
127.0.0.1:6379> ECHO "Hello World!" "Hello World!"
More: http://redis.io/commands/echo, http://www.redis.cn/commands/echo.html
PING
Ping the server
127.0.0.1:6379> PING PONG
More: http://redis.io/commands/ping, http://www.redis.cn/commands/ping.html
QUIT
Close the connection
More: http://redis.io/commands/quit, http://www.redis.cn/commands/quit.html
SELECT index
Change the selected database for the current connectionconnection
127.0.0.1:6379> SELECT 9 OK 127.0.0.1:6379[9]> SELECT 6 OK 127.0.0.1:6379[6]> SELECT 0 OK 127.0.0.1:6379>
More: http://redis.io/commands/select, http://www.redis.cn/commands/select.html
Redis(2.8.3) 命令学习 - Connection
原文：http://www.cnblogs.com/huey/p/4351090.html