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Re: [O] No output from babel shell src block

From: Ken Mankoff
Subject: Re: [O] No output from babel shell src block
Date: Thu, 12 May 2016 15:36:03 -0400
User-agent: mu4e 0.9.17; emacs 24.5.1

This is a known issue with diff, I think. Add a line containing ":" below, or 
"echo" or "diff foo bar | cat".


I have

(setq org-babel-default-header-args:sh
  '((:prologue . "exec 2>&1") (:epilogue . ":"))

so that stderr is always displayed in the RESULTS block.

On 2016-05-12 at 15:24, John Hendy <address@hidden> wrote:
> Hello,
> I've not used shell in babel much, and am confused. I was trying to
> include diff output from a block in an analysis and it's not giving
> any output.
> As a test, I have a.txt which contains 1 and b.txt which contains 2,
> with boths in ~/Desktop.
> Manually:
> $ cd ~/Desktop
> $ diff a.txt b.txt
> 1c1
> < 1
> ---
>> 2
> Org:
> #+begin_src shell
> cd ~/Desktop
> diff a.txt b.txt
> #+end_src
> I get "Code block produced no output" with C-c C-c. If I replace the
> diff line with =pwd=, it puts the current directory in the results
> block (works as expected).
> I've tried replace, append, output, raw, and value for :results, as
> well as results and both for :exports. I've also tried using a #+name:
> which gives me a results block for the output, but it's empty.
> Am I missing something? Perhaps there's an analog for how some
> programs need a print() of some kind for the results to show up? Then
> again, I don't know why =pwd= works... There's no worg page for the
> shell language (surprised me!).
> Thanks,
> John

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