why redis is used code example

Example 1: who uses redis

install redis

$ wget http://download.redis.io/releases/redis-5.0.8.tar.gz
$ tar xzf redis-5.0.8.tar.gz
$ cd redis-5.0.8
$ make

Example 2: who uses redis

Launch redis
$ src/redis-server

Example 3: who uses redis

Redis launch from any dir

$ sudo make test install
$ redis-server

Example 4: who uses redis

Redis built in client
$ src/redis-cli
redis> set foo bar
OK
redis> get foo
"bar"