Displaying commands

I am playing in minecraft 1.12.2

I want to make a command block that when activated runs the /seed command and tells the world seed to everyone on the server (preferably in the game chat. Is there any way to do this

Solution 1:

There seems to be no way to do this dynamically, you can only copy the seed manually and insert it into a command.

(In 1.13+ you could run /execute store result score @s score_name run seed and it's probably possible to do something similar with /stats in 1.12, but that overflows the integer range for a scoreboard almost every time, so you don't get the correct number.
There is also no JSON component that displays the seed.)