> client help
 1) CLIENT <subcommand> arg arg ... arg. Subcommands are:
 -- 返回当前的连接ID，可用于kill
 2) ID                     -- Return the ID of the current connection.
 -- 返回当前连接的名字
 3) GETNAME                -- Return the name of the current connection.
 -- Kill 来自某个地址的连接
 4) KILL <ip:port>         -- Kill connection made from <ip:port>.
 -- Kill 连接
 5) KILL <option> <value> [option value ...] -- Kill connections. Options are:
 -- Kill 来自某个地址的连接
 6)      ADDR <ip:port>                      -- Kill connection made from <ip:port>
 -- 按类型Kill连接
 7)      TYPE (normal|master|replica|pubsub) -- Kill connections by type.
 -- Kill通过该用户身份验证的连接
 8)      USER <username>   -- Kill connections authenticated with such user.
 -- 跳过Kill当前连接，默认yes
 9)      SKIPME (yes|no)   -- Skip killing current connection (default: yes).
 -- 返回客户端连接的信息
10) LIST [options ...]     -- Return information about client connections. Options:
 -- 返回指定类型的客户端
11) 　　TYPE (normal|master|replica|pubsub) -- Return clients of specified type.
 -- 暂停所有客户端<timout>毫秒
12) PAUSE <timeout>        -- Suspend all Redis clients for <timout> milliseconds.
 -- 控制服务器对当前客户端的回复，ON：默认，回复；OFF：不回复客；SKIP：跳过回复
13) REPLY (on|off|skip)    -- Control the replies sent to the current connection.
-- 给当前连接设置名字
14) SETNAME <name>         -- Assign the name <name> to the current connection.
-- 取消指定的被阻止的客户端 
15) UNBLOCK <clientid> [TIMEOUT|ERROR] -- Unblock the specified blocked client.
-- 客户端缓存启用key跟踪
16) TRACKING (on|off) [REDIRECT <id>] [BCAST] [PREFIX first] [PREFIX second] [OPTIN] [OPTOUT]... -- Enable client keys tracking for client side caching.
-- 启用跟踪时，返回重定向到的客户端ID
17) GETREDIR               -- Return the client ID we are redirecting to when tracking is enabled.
-- 启用跟踪时，控制在连接执行的下一个命令中对键的跟踪（在连接中设置一个状态，该状态仅对下一个命令执行有效）
18) CACHING （YES|NO）     -- Basically the command sets a state in the connection, that is valid only for the next command execution, that will modify the behavior of client tracking.

# /usr/local/redis6.0/bin/redis-cli -h 192.168.163.134 -p 8379 --help
redis-cli 6.0.3

Usage: redis-cli [OPTIONS] [cmd [arg [arg ...]]]
-- 服务地址
  -h <hostname>      Server hostname (default: 127.0.0.1).
-- 服务端口
  -p <port>          Server port (default: 6379).
-- 服务套接字
  -s <socket>        Server socket (overrides hostname and port).
-- 服务密码
  -a <password>      Password to use when connecting to the server.
                     You can also use the REDISCLI_AUTH environment
                     variable to pass this password more safely
                     (if both are used, this argument takes predecence).
-- ACL设置的用户
  --user <username>  Used to send ACL style 'AUTH username pass'. Needs -a.
-- ACL设置的密码
  --pass <password>  Alias of -a for consistency with the new --user option.
-- 强制设置密码
  --askpass          Force user to input password with mask from STDIN.
                     If this argument is used, '-a' and REDISCLI_AUTH
                     environment variable will be ignored.
-- 服务URI
  -u <uri>           Server URI.
-- 指定执行的命令次数
  -r <repeat>        Execute specified command N times.
-- 间隔多少秒执行指定的命令
  -i <interval>      When -r is used, waits <interval> seconds per command.
                     It is possible to specify sub-second times like -i 0.1.
-- 数据库号                    
  -n <db>            Database number.
-- RESP协议
  -3                 Start session in RESP3 protocol mode.
-- 读取标准输入的最后一个参数
  -x                 Read last argument from STDIN.
-- 分隔符，默认\n
  -d <delimiter>     Multi-bulk delimiter in for raw formatting (default: \n).
-- 开启集群模式
  -c                 Enable cluster mode (follow -ASK and -MOVED redirections).
-- 回复请求格式
  --raw              Use raw formatting for replies (default when STDOUT is
                     not a tty).
-- 格式化输出              
  --no-raw           Force formatted output even when STDOUT is not a tty.
-- 导出格式
  --csv              Output in CSV format.
-- 打印服务器的统计数据
  --stat             Print rolling stats about server: mem, clients, ...
-- 持续采样延迟模式，在交互式会话中使用此模式，显示实时统计信息。 如果指定了--raw或--csv，或者将输出重定向到非TTY，则它将对延迟进行采样1秒钟（可以使用-i更改间隔），然后生成单个输出并退出
  --latency          Enter a special mode continuously sampling latency.
                     If you use this mode in an interactive session it runs
                     forever displaying real-time stats. Otherwise if --raw or
                     --csv is specified, or if you redirect the output to a non
                     TTY, it samples the latency for 1 second (you can use
                     -i to change the interval), then produces a single output
                     and exits.
-- 像--latency一样，但是跟踪延迟随时间变化。 默认时间间隔是15秒。 使用-i进行更改。
  --latency-history  Like --latency but tracking latency changes over time.
                     Default time interval is 15 sec. Change it using -i.
-- 将延迟显示为频谱，需要xterm 256色。 默认时间间隔是1秒。 使用-i进行更改。
  --latency-dist     Shows latency as a spectrum, requires xterm 256 colors.
                     Default time interval is 1 sec. Change it using -i.
-- 模拟工作负载
  --lru-test <keys>  Simulate a cache workload with an 80-20 distribution.
-- 模拟从主接收到的命令的副本
  --replica          Simulate a replica showing commands received from the master.
-- 将远程服务的RDB转存到本地
  --rdb <filename>   Transfer an RDB dump from remote server to local file.
-- 将原始Redis协议从stdin传输到服务器
  --pipe             Transfer raw Redis protocol from stdin to server.
-- pipe模式下的超时时间，默认30秒。
  --pipe-timeout <n> In --pipe mode, abort with error if after sending all data.
                     no reply is received within <n> seconds.
                     Default timeout: 30. Use 0 to wait forever.
-- 查找具有每个类型最多元素的key
  --bigkeys          Sample Redis keys looking for keys with many elements (complexity).
-- 查找每个类型消耗大量内存的key
  --memkeys          Sample Redis keys looking for keys consuming a lot of memory.
--  定义要采样的key元素的数量    
  --memkeys-samples <n> Sample Redis keys looking for keys consuming a lot of memory.
                     And define number of key elements to sample
--  查找热key，在maxmemory-policy为* lfu时有效                
  --hotkeys          Sample Redis keys looking for hot keys.
                     only works when maxmemory-policy is *lfu.
--  使用SCAN命令列出所有键                   
  --scan             List all keys using the SCAN command.
--  与scan一起使用以指定扫描模式
  --pattern <pat>    Useful with --scan to specify a SCAN pattern.
-- 运行测试以测量内部系统延迟，测试将运行指定的秒数。
  --intrinsic-latency <sec> Run a test to measure intrinsic system latency.
                     The test will run for the specified amount of seconds.
-- 使用<file>处的Lua脚本发送EVAL命令
  --eval <file>      Send an EVAL command using the Lua script at <file>.
-- 与--eval一起使用，启用Redis Lua调试器
  --ldb              Used with --eval enable the Redis Lua debugger.
-- 与--ldb一样，但使用同步Lua调试器，在这种模式下，服务器被阻止，脚本更改不会从服务器内存中回滚
  --ldb-sync-mode    Like --ldb but uses the synchronous Lua debugger, in
                     this mode the server is blocked and script changes are
                     not rolled back from the server memory.
-- 集群管理                 
  --cluster <command> [args...] [opts...]
                     Cluster Manager command and arguments (see below).
-- 详细模式
  --verbose          Verbose mode.
-- 命令行界面上使用密码时，不显示警告消息
  --no-auth-warning  Don't show warning message when using password on command
                     line interface.
  --help             Output this help and exit.
  --version          Output version and exit.

Cluster Manager Commands:
  Use --cluster help to list all available cluster manager commands.

-- 示例 
Examples:
  cat /etc/passwd | redis-cli -x set mypasswd
  redis-cli get mypasswd
  redis-cli -r 100 lpush mylist x
  redis-cli -r 100 -i 1 info | grep used_memory_human:
  redis-cli --eval myscript.lua key1 key2 , arg1 arg2 arg3
  redis-cli --scan --pattern '*:12345*'

  (Note: when using --eval the comma separates KEYS[] from ARGV[] items)

When no command is given, redis-cli starts in interactive mode.
Type "help" in interactive mode for information on available commands
and settings.

1：--pipe
echo -e "*3\r\n\$3\r\nset\r\n\$8\r\nstring_a\r\n\$6\r\ndba\r\n"  | /usr/local/redis6.0/bin/redis-cli -h 192.168.163.134 -p 9379 --pipe
等同于
echo -e "*3\r\n\$3\r\nset\r\n\$3\r\ndba\r\n\$6\r\ncaocao\r\n" | nc 127.0.0.1 15391

2：--bigkeys
使用scan方式对每个类型的key进行统计，无需担心对redis造成阻塞，最大key只有string类型是以字节长度为衡量标准的。list,set,zset等都是以元素个数作为衡量标准，不能说明其占的内存就一定多

3：--memkeys
查找每个类型消耗大量内存的key

4：--hotkeys
需要用LFU才能使用

5：--rdb
导出远程的rdb到本地

6：--scan
遍历所有的key

7：--raw
使用原始格式

8：--cluster
集群操作