The REPL executes elixir code, which generally means functions are called one per line. So you’d do:

iex(1)> IO.puts("hello world")
hello world
:ok
iex(2)> IO.puts("wazzup")
wazzup
:ok

You can put multiple commands on the same line and execute them unconditionally by separating them with a ;

iex(3)> IO.puts("hello world"); IO.puts("wazzup")
hello world
wazzup
:ok

You can use && to conditionally call functions as long as prior functions returned something “truthy”

iex(4)> true && IO.puts("wazzup")
wazzup
:ok
iex(5)> false && IO.puts("wazzup")
false

Basically it’s just Elixir code.

Hey @granyatee are you talking about running multiple mix tasks, or executing multiple commands inside the REPL that iex provides?

if you are talking the mix command, you can achieve that with mix do
for example:
mix do task1, task2, task3