This is the Erlang equivalent of the OTP app in the Elixir Building OTP apps with Mix documentation, implemented mainly as an exercise/example.
make
erl -pa ebin/
... then ...
1> application:start(stackerl).
ok
2> gen_server:cast(stackerl_server, {push, foo}).
ok
3> gen_server:cast(stackerl_server, {push, bar}).
ok
4> gen_server:call(stackerl_server, pop).
bar
5> gen_server:call(stackerl_server, pop).
foo
6> gen_server:call(stackerl_server, pop).
helloetc.