Publish & Subscribe for dummies:

Open 2 different windows (pane) in terminal and go to redis console:

redis-cli

Now to subscribe into a specific channel:

127.0.0.1:6379> SUBSCRIBE first second
 Reading messages... (press Ctrl-C to quit)
 1) "subscribe"
 2) "first"
 3) (integer) 1
 1) "subscribe"
 2) "second"
 3) (integer) 2

As you can see we have subscribed to 2 channels called first and second. In another window open redis console again by redis-cli command and try to publish to those channels:

PUBLISH second Hello

Now you should see the output below in the first window where you have subscribed to channels:

1) "message"
 2) "second"
 3) "Hello"

If you want to know more about pub-sub scenario:
https://en.wikipedia.org/wiki/Publish%E2%80%93subscribe_pattern

#redis #pub_sub #publish #subscribe #redis_cli

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