#+Title: Example 

* one table
| 1 |  2 |
| 2 |  4 |
| 3 |  6 |
| 4 |  8 |
| 5 | 10 |

* another table
| 20 | 20 |

* and one more
| 0 | 1 |
| 0 | 1 |

* here we sum them up
#+begin_src sh :results scalar :var file=(buffer-file-name) :var col=1
  cat $file|grep "^|"|sed 's/|//g'|awk '{ sum += $1} END{ print sum }'
#+end_src

#+RESULTS:
: 35