title: How to sum from 100 file - bash/awk?
body: <p>I need to sum up values from 100 files. This is part of my input
  suma_wiazan_wodorowych_2_1.txt</p>
  <pre><code>2536
  1928
  1830
  1774
  1732
  1673
  1620
  </code></pre>
  <p>suma_wiazan_wodorowych_2_101.txt   (name for every file is changing by 100, so 1, 101, 201 etc)</p>
  <pre><code>2535
  1987
  1895
  1829
  1805
  1714
  1657
  </code></pre>
  <p>So my script should add first row from the first file first row from the second file .... to one hundred
  2535+2536+..+..+2621
  And against the second row from the first + second row from the second file etc.
  The length of every file is 5000 rows (so I will have 5000 sums)
  Do you have any idea?</p>