Info Catalog sed: uniq -d sed: Examples sed: cat -s

sed: uniq -u

 
 7.19 Remove All Duplicated Lines
 ================================
 
 This script prints only unique lines, like 'uniq -u'.
 
      #!/usr/bin/sed -f
 
      # Search for a duplicate line --- until that, print what you find.
      $b
      N
      /^\(.*\)\n\1$/ ! {
          P
          D
      }
 
      :c
      # Got two equal lines in pattern space.  At the
      # end of the file we simply exit
      $d
 
      # Else, we keep reading lines with N until we
      # find a different one
      s/.*\n//
      N
      /^\(.*\)\n\1$/ {
          bc
      }
 
      # Remove the last instance of the duplicate line
      # and go back to the top
      D
 

Info Catalog sed: uniq -d sed: Examples sed: cat -s