awk - Bash rows to column -

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I know that to move the rows in a file in a column, but I add the lower half of a file Like

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  A1A2A3B1B2B3   
 From   pre>  A1 | B1A2 | B2A3 | B3   
 list comes from two  grep  I add the first  grep  to the second one.   
 
  
 
  head  and  tail  What about "post-text" itemprop = "text"> 
 
  paste-d '|' about mixing with  paste .  
  A1 | B1A2 | B2A3 | B3   / code>  
  paste  merges lines of files if we provide different lines from the same file ... All!  
 Because it is a case of obtaining the  head  from half of the lines and  tail  / code> from the rest, this is a more common way:  
  paste-d '|' & Lt; (Head-n $ (($ (wc -l & lt; file) / 2)) file) & lt; (Tail-n $ (($ (wc -l & lt; file) / 2)))

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