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erlangerlang-shellerl

Erlang command line

I need to pass two arguments to my Erlang code. it is working fine in the Erlang shell.

2> crop:fall_velocity(x,23).
  21.23205124334434

but how should i run the Erlang code without the Erlang shell. like normal python,c programs. ./program_name (not passing $1 $2 arguments).

I was trying this

erl -noshell -s crop fall_velocity(x,20) -s init stop

But it is giving unexpected token error.

Solution

  • As documentation states, the -s passes all parameters supplied as just one list of atoms and -run does the same but as a list of strings. If you want to call arbitrary function with arbitrary parameter count and types you should use -eval:

    $ erl -noshell -eval 'io:format("test\n",[]),init:stop()'
test
$