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Thanks Monks,

They all work well. However, except the perl one liners suggested no other scripts does what I wanted which in the end was to count the number ie 3 and print it on the screen!

Also, how do I adapt the scripts to do this for a list (a second file - random.txt) separated by space as shown in the example below:

2 3 2 3 2 1 2 1 3 2 1 3 3 3 1 3 1 2

Notice there is a space in the first line. The numbers are clustered in the manner in which the r's common to all columns should be counted. For example print only the r's in column 2, then print all the r's common in all rows of column 3 and 2, then print the r's common to all rows in column 3 , 2 and 1.

so the printed output for my file my_column_file.txt should below:

0 a b h 1 - r z 3 u - u 4 r x r 5 r t r 6 r r r 7 r r r 8 r r r <p>should be:(the out put with explainations) </p> 4 3 3 (ie for 2 32 321) 4 5 3 (ie for 2 13 213) 5 5 3 (ie for 3 31 312) the out put desired 4 3 3 4 5 3 5 5 3

In reply to Re^2: Count similar characters in a row by $new_guy
in thread Count similar characters in a row by $new_guy

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