shell - BASH: Iterate range of numbers in a for cicle -

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I want to create an array from the list of words. Therefore, I am using this code: 

  in the array {$ i] = $ (cat file.txt | cut -d ',' - f3 | sort -r | uniq | tail -n $ {i}) done   
 but it failed ... in  tail -n $ {i}   
 I have already tried  tail- n $ i ,  tail- n $ (i) , but  i < / Code>  
 Any thoughts?   
 
 
 This fails because you can not use a variable   (( ...))  can use operators:  
 for  ((i = 1; i & lt; = count; i ++)); Array [$ i] = $ (cut-d ',' -f3 file.txt | sort -r | uniq | tail -n $ i) done   
 In addition, Em> Unusual use of cat from your order .

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