RobertS

RobertS

Hey, I am trying to set up an elixir escript for a simple script.

I want to pass a result from echo using Linux pipe.

Here is an example:
echo -e '1234' | ./script argument

However in main script function:

  def main(args) do
    IO.inspect(args)
  end

when inspecting args I see only:
["argument"] instead of ["1234", "argument"]

Would appreciate your help or any resources.

Marked As Solved

RobertS

RobertS OP

I found it:
The pipe operator passes the data as stdin so you need to do IO.read(:stdio, :line) in main to read it.

Also Liked

Tuxified

Tuxified

IIRC linux pipes pass info to the next process via STDIN, so I think you need some function from IO module to read it, for example:

defmodule MyScript do
  def main(args) do
    IO.inspect(args, label: "Args")

    Enum.each(IO.stream(:stdio, :line), &IO.write("stdio: #{&1}"))
  end
end

[edit]
You found the anwser while I was looking at Elixir docs :+1:

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