Question

Something like

erl -s crypto start -s application start public_key

works for crypto but not application:start(..). Typically I have call application supervisor but not application itself. What’s the normal way of doing it?

Answer 1

The -s flag expects

Module Fun Arg1 Arg2 ..

and executes it as

module:fun([Arg1, Arg2, ..]).

So, it passes the arguments as a list.

When running -s application start public_key it wil call application:start([public_key]), which isn’t supported. This works: application:start(public_key)

I did not found a workaround for it without creating a module that contains a function to start up the public_key application, like:

-module(myapp).

-export([start/1]).

start([App]) -> application:start(App).

And call it like

erl -s crypto start -s myapp start public_key