They could be useful for doctests such when dealing with file and dirs creation 
and removal,
you cd/1 a dir, and then mkdir_p, and `touch` a file and `ls` the contents of 
the specific dir,



On Mon, 8 May 2017 18:17:33 +0200
José Valim <jose.va...@plataformatec.com.br> wrote:

> pwd and ls are not going to be effective in doctests as the results will be
> highly dependent of the user directory and what is on their machine.
> 
> 
> 
> *José Valim*
> www.plataformatec.com.br
> Skype: jv.ptec
> Founder and Director of R&D
> 
> On Mon, May 8, 2017 at 5:16 PM, eksperimental <eksperimen...@autistici.org>
> wrote:
> 
> > José Valim <jose.va...@plataformatec.com.br> wrote:
> > > We should support regular comments (a-I). We should not support (a-II)
> > and
> > > (a-III) because they are not valid in IEx.
> >
> > How come, since they are all treated as comments by IEx.
> >
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