meaning of 'none' in the shell

The return value of usrdb:init/0 is none.

In this case, none is an atom, and it is the value of the last expression of the function usrdb:init/0.

Cheers,

Yao

> 在 2020年12月1日，10:42，Peter J Etheridge <[email protected]> 写道：
> 
> 
> Dear Fellow Erlangers,
> 
> This module used to run. I have broken it somehow.
> 
> Now I get;
> 
>> mnesia:delete_schema([node()]).
> ok
>> mnesia:create_schema([node()]).
> ok
>> mnesia:start().
> ok
>> c(usrdb).
> {ok,usrdb}
>> usrdb:init().
> none
> 
> What does 'none' mean in the shell?
> 
> Where should i be looking for my error?
> 
> Thank you in advance.
> 
> Happy programming to all,
> Peter