[erlang-questions] run program from commandprompt? define function?

Circular Function <>
Sat May 31 15:24:54 CEST 2008


double(X) ->
    2 * X.

saved that in tut.erl, placed it in the bin/ and tried to run it but it asks for a specific program to run.

Erlang (BEAM) emulator version 5.6.2 [async-threads:0]

Eshell V5.6.2  (abort with ^G)
1> c(tut).
../tut.erl:none: no such file or directory

so which install do i need?

how do i define a function?

can i do that directlyin the shell?

like in python:
def sq(x): return x*x

how would i dot hat in erlang?

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