** passing values through to STDIN of shell code blocks
   :PROPERTIES:
   :DATE:     2011-05-26
   :END:
#+name: square-table
| 1 | 2 | 3 |
| 4 | 5 | 6 |
| 7 | 8 | 9 |

#+name: first-col
#+begin_src sh :stdin square-table
  awk '{print $1}'
#+end_src

#+begin_src sh :stdin first-col
  sed 's/4/middle/g'
#+end_src

#+name:
|      1 |
| middle |
|      7 |