Shell script block gives no output when evaluated

Shell script block gives no output when evaluated

[Phil Mason]

Hello all,

If I evaluate the following source block in emacs 23.1.1, org mode v7.8.03 it reports that it produces no output:

     #+begin_src sh :results replace
       foo=1
       if [[ -n "$foo" ]]; then
           echo "foo has been defined (and has value $foo)"
       else
           echo "foo has not been defined"
       fi       
       if [[ -n "$bar" ]]; then
           echo "bar has been defined (and has value $bar)"
       else
           echo "bar has not been defined"
       fi       
     #+end_src

Confusingly if I remove either if block then the results for the remaining one is correct and if I run the same code from within an actual script it works as I expect (foo is defined, bar is not). Can anybody provide any clues about what I'm doing wrong.

Thanks in advance

Phil

Re: Shell script block gives no output when evaluated

[Eric Schulte]

"Phil Mason" <phil.mason@broadcom.com> writes:

> Hello all,
>
> If I evaluate the following source block in emacs 23.1.1, org mode
> v7.8.03 it reports that it produces no output:
>
>      #+begin_src sh :results replace
>        foo=1
>        if [[ -n "$foo" ]]; then
>            echo "foo has been defined (and has value $foo)"
>        else
>            echo "foo has not been defined"
>        fi       
>        if [[ -n "$bar" ]]; then
>            echo "bar has been defined (and has value $bar)"
>        else
>            echo "bar has not been defined"
>        fi       
>      #+end_src
>
> Confusingly if I remove either if block then the results for the
> remaining one is correct and if I run the same code from within an
> actual script it works as I expect (foo is defined, bar is not). Can
> anybody provide any clues about what I'm doing wrong.
>
> Thanks in advance
>

I believe adding :results output should fix this problem, as what you
want is a collection of the text printed to STDOUT.

With that change I get the following...

#+begin_src sh :results replace output
  foo=1
  if [[ -n "$foo" ]]; then
      echo "foo has been defined (and has value $foo)"
  else
      echo "foo has not been defined"
  fi       
  if [[ -n "$bar" ]]; then
      echo "bar has been defined (and has value $bar)"
  else
      echo "bar has not been defined"
  fi       
#+end_src

#+RESULTS:
: foo has been defined (and has value 1)
: bar has not been defined

>
> Phil
>
>

-- 
Eric Schulte
http://cs.unm.edu/~eschulte/