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  1. kavitha= Tue Feb 20 14:00 19 IST 2012 (duplicate entry)
  2. sree=Tue Jan 20 14:05 19 IST 2012
  3. divya = Tue Jan 20 14:20 19 IST 2012
  4. anusha=Tue Jan 20 14:45 19 IST 2012
  5. kavitha= Tue Feb 20 14:00 19 IST 2012 (duplicate entry)
  6.  
  7. kavitha= Tue Feb 20 14:00 19 IST 2012
  8. sree=Tue Jan 20 14:05 19 IST 2012
  9. divya = Tue Jan 20 14:20 19 IST 2012
  10. anusha=Tue Jan 20 14:45 19 IST 2012
  11.  
  12. $ sort -u file.txt
  13.  
  14. $ awk '!a[$0]++' input.txt
  15.  
  16. sed '$!N; /^(.*)n1$/!P; D'
  17.  
  18. cat -n file.txt |
  19. sort -u -k2,7 |
  20. sort -n |
  21. sed 's/.*t/ /;s/([0-9]{4}).*/1/'
  22.  
  23. awk '{line=substr($0,1,match($0,/[0-9][0-9][0-9][0-9]/)+3);sub(/^/," ",line);if(!dup[line]++)print line}' file.txt
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