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Search for repeats in text file - how?

 
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# 1  
Old 03-30-2006
Search for repeats in text file - how?
I have a text file that I want to search for repeated lines and print those lines. These would be lines in the file that appear more than once. Is there a way to do this?

Thanks
# 2  
Old 03-30-2006
man sort
man uniq
# 3  
Old 03-30-2006
This stores the duplicate lines in a file = dup.lines
Code:
awk '{x[$0]++;                         
      if( x[$0] > 1) { print $0}       
     } ' filename > dup.lines

# 4  
Old 03-30-2006
Quote:
Originally Posted by jim mcnamara
This stores the duplicate lines in a file = dup.lines
Code:
awk '{x[$0]++;                         
      if( x[$0] > 1) { print $0}       
     } ' filename > dup.lines

a slight modification - considering you don't want to print a line EVERY time the line is repeated.
Code:
awk '{x[$0]++}
       END { for (i in x)                      
                  if( x[i] > 1 ) { print x[i]}       
       } ' filename > dup.lines

# 5  
Old 04-03-2006
how about

uniq -d <yourfile.txt >dup.lines
 
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