The UNIX and Linux Forums  

Go Back   The UNIX and Linux Forums > Top Forums > Shell Programming and Scripting
Reload this Page duplicate line in a text file
.
google unix.com

Forums Register Forum RulesLinksAlbums FAQ Members List Calendar Search Today's Posts Mark Forums Read



Thread: duplicate line in a text file
View Single Post in the UNIX and Linux Forums - Click on the Thread or Permalink to View Entire Thread -->
  #6 (permalink)  
Old 04-29-2008
summer_cherry summer_cherry is offline Forum Advisor  
Registered User
  
 

Join Date: Jun 2007
Location: Beijing China
Posts: 1,089

Code:
awk '{
  a[$0]++
}
END{
 for (i in a)
 if (a[i]=2)
 print i
}' filename