select n 切换DB， n表示数据库ID

# telnet 192.168.41.160 6379
Trying 192.168.41.160...
Connected to 192.168.41.160.
Escape character is '^]'.
select 1
+OK

			

			
redis 127.0.0.1:6379> info
redis_version:2.4.10
redis_git_sha1:00000000
redis_git_dirty:0
arch_bits:64
multiplexing_api:epoll
gcc_version:4.4.6
process_id:29663
uptime_in_seconds:1189
uptime_in_days:0
lru_clock:1018411
used_cpu_sys:0.10
used_cpu_user:0.09
used_cpu_sys_children:0.01
used_cpu_user_children:0.00
connected_clients:1
connected_slaves:0
client_longest_output_list:0
client_biggest_input_buf:0
blocked_clients:0
used_memory:730664
used_memory_human:713.54K
used_memory_rss:7225344
used_memory_peak:730720
used_memory_peak_human:713.59K
mem_fragmentation_ratio:9.89
mem_allocator:jemalloc-2.2.5
loading:0
aof_enabled:0
changes_since_last_save:0
bgsave_in_progress:0
last_save_time:1373332622
bgrewriteaof_in_progress:0
total_connections_received:4
total_commands_processed:14
expired_keys:0
evicted_keys:0
keyspace_hits:3
keyspace_misses:0
pubsub_channels:0
pubsub_patterns:0
latest_fork_usec:744
vm_enabled:0
role:master
db0:keys=4,expires=0
redis 127.0.0.1:6379>
			
			

telnet方式

# telnet 172.18.52.13 6379
Trying 172.18.52.163...
Connected to 172.18.52.13.
Escape character is '^]'.
MONITOR
+OK
+1425454378.190210 "MONITOR"
+1425454381.165317 "GET" "admin:633"
+1425454381.165725 "SET" "admin:633" "{\"id\":\"633\",\"username\":\"7209\",\"password\":\"eea5981a4fd021b8d78f8431084ba760\",\"status\":\"N\",\"belong_user_id\":\"133\",\"level_id\":\"67\",\"create_time\":1425454381,\"session_id\":\"l1s609t9gq8nj7vc94hb1i3s25\"}"
+1425454381.166088 "EXPIRE" "admin:633" "3600"
+1425454387.956387 "GET" "admin:633"			
			

使用 nc 监控状态

# (echo -en "MONITOR\r\n"; sleep 10) | nc 172.18.52.13 6379
			

查询所有key

			
172.18.52.15:6379> keys *
 1) "www.example.com:743f10d0f1dc569ed5893856e14c1fb7captcha"
 2) "www.example.com:d88e0b6c54a235763dd731bcc0914439captcha"
 3) "www.example.com:17f9091cb44f3cc5bb411eb801f07be8member_login"
 4) "www.example.com:10ff594fd42f4c81212020555cfb586amember_login_input"
 5) "www.example.com:a759ba5232ce324d0e6ae8da9290beaecaptcha"
 6) "www.example.com:37c78410af02d66a542d15b9707f215bcaptcha"
 7) "www.example.com:9f5070e217f4eac9a1d15f9b8dbe7148deposit_1_temp_var"
 8) "www.example.com:6c1a13c9396df2c35613043923bfe338captcha"
 9) "www.example.com:b611080c0627154871ea0e1498793238captcha"
10) "www.example.com:2792241f8d0f075528db2b50e0c9c684member_login"
			
			

查询指定key

			
172.18.50.15:6379> set name neo
OK
172.18.50.15:6379> keys name
1) "name"			
				
			

			
172.18.52.15:6379> set name neo
OK
172.18.52.15:6379> get name 
"neo"
172.18.52.15:6379> keys name
1) "name"
172.18.52.15:6379> del name
(integer) 1
172.18.52.15:6379> get name
(nil)			
			
			

EXPIRE 设置过期时间, TTL 可以查询过期时间倒计时。

			
172.18.52.165:6379> set name neo
OK
172.18.52.165:6379> ttl name
(integer) -1
172.18.52.165:6379> expire name 30
(integer) 1
172.18.52.165:6379> ttl name
(integer) 22
172.18.52.165:6379> ttl name
(integer) 9
172.18.52.165:6379> ttl name
(integer) -1
172.18.52.165:6379> get  name
(nil)
			
			

注意ttl返回-1有两种情况，一是没有设置过期时间，另一种是该key已经过期不存在。