Redis related

1. lookup redis The installation path 
whereis redis

2. Switch to redis The scripts directory , Sign in redis
./redis-cli -h xxx.xxx.xxx.xx -p xxxx

3. View the current database key The number of , perform ：dbsize command 
（ If appear (error) ERR unknown command ‘(error)’ , Input auth  password  ）

4.auth  password 

5. View all key value 
keys *
 View possible key value （ Regular ）
keys abc* - With any number of characters ,abcd,abcdefg You can find 
keys h?llo - Pass on a single character ,hello/hallo
keys a[bc]ple  -[] Wildcard a character in parentheses , or abple, or acple, Can not be aple
keys a[a-b-c]ple  - amount to or, matching a/b/c
keys a[^f]ple  - matching f The previous letter 

 In combination with 
keys h[a-b-c]*llo: matching ha( Arbitrarily )llo,  perhaps hb( Arbitrarily )llo,  perhaps hc( Arbitrarily )llo

6. Delete the value of the specified index ：del key
6.1（ demonic magic ） Delete the specified prefix in batch key value . This operation needs to exit redis library , utilize Linux Pipeline command implementation of 
./redis-cli -h xx.xx.xx.xx -a " The password is written in quotation marks " keys " Conditions *" | xargs ./redis-cli -h xx.xx.xx.xx -a " The password is written in quotation marks " del

7. Empty the whole  Redis  Server data ：flushall

8. Empty all... In the current library  key：flushdb

9、 sign out ：exit;