[erlang-questions] du in Erlang as a first attempt at an application

Minsloc Tarren <>
Tue Sep 18 11:01:13 CEST 2007


Something like this should work

<pseudo-code>
dirsize(Dir) ->
  {Dirs,Files} = listdir(Dir),
  sum([filesize(File) || File <- Files])      % iterate over Files,
collecting return values of filesize(<file>), then sum the list
    + sum([dirsize(Dir2) || Dir2 <- Dirs]).  % ditto for for directories
(recursively)
</pseudo-code>

Not so effective, but quite elegant, I hope ;-)

Does not detect circular links ...

On 9/18/07, Jarrod Roberson <> wrote:
>
> I am trying to grok how to write a simple 'du' like program that walks
> a directory structure ( not just one but all nested directories ) and
> calculates a sum of all the file sizes. I found some sum() code that I
> understand how that works.
>
> I have stared at my Programming Erlang book I got a few days ago, and
> stared at the Erlang Cookbook as well as staring and hacking at the
> erlang shell and it just isn't clicking.
>
> >From what I see, this should be like a 5 line program in Erlang.
>
> Can anyone provide a working example or point me in the correct direction?
> _______________________________________________
> erlang-questions mailing list
> 
> http://www.erlang.org/mailman/listinfo/erlang-questions
>
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