title: How to see several types/kind of values in a particular column in linux?
body: <p>I have a .txt file in linux (with 56 columns and 18000 rows) named 'file1.txt' with the data that looks like this;</p>
  <pre><code>C1  C2  C3  C4  C5  C6
  1   2   3   4   5   6
  0   1   2   3   4   5
  2   3   0   0   0   0
  3   4   1   1   1   1
  0.008   0   2   0.008   0   2
  1.999   1   0   1.999   1   0.001
  0.04    2   1   0.04    2   4
  0   0.001   2   0   0   3
  1   1   0   5   0   0.008
  2   2   0.013   0.008   1   1.999
  0   0.999   0   1.999   1.99    0.04
  0   2   1   1.758   0   1
  1   1.999   2   0.002   2   1
  1.99    1.999   2   0.003   1.99    0
  0   1.999   1   10  0   9
  </code></pre>
  <p>Question: How do I see several kind/types of values a particular column has? For example, I want to see that in column C3 how many kind of values are there like a list of 0, 1,2,3,0.013 and so on).</p>