redis show all keys

C++
KEYS *# From shell
redis-cli --raw keys "KeyPrefix*" 
# or
redis-cli --scan --pattern "KeyPrefix*" $ redis-cli
> KEYS *
1) "title:1"
2) "title:2"
3) "title"
4) "author:2"
5) "author"
6) "author:1"

Source

Also in C++: