keys
返回满足给定条件的所有key
127.0.0.1:6379> keys *
1) "testlist2"
2) "testset4"
3) "testset2"
4) "mytest"
5) "num2"
6) "testset1"
7) "testset3"
8) "testset"
127.0.0.1:6379> keys testset*
1) "testset4"
2) "testset2"
3) "testset1"
4) "testset3"
5) "testset"返回满足给定条件的所有key
127.0.0.1:6379> key
