Remove duplicate rows of an un-sorted file based on a single column

• Remove duplicate rows of an un-sorted file based on a single column

  The command (above) will remove any duplicate rows based on the FIRST column of data in an un-sorted file. The '$1' represents a positional parameter. You can change both instances of '$1' in the command to remove duplicates based on a different column, for instance, the third: awk '{ if ($3 in stored_lines) x=1; else print; stored_lines[$3]=1 }' infile.txt > outfile.txt Or you can change it to '$0' to base the removal on the whole row: awk '{ if ($0 in stored_lines) x=1; else print; stored_lines[$0]=1 }' infile.txt > outfile.txt ** Note: I wouldn't use this on a MASSIVE file, unless you're RAM-rich ;) **

  This is sample output - yours may be different.

  
  

  4
  awk '{ if ($1 in stored_lines) x=1; else print; stored_lines[$1]=1 }' infile.txt > outfile.txt
  dopeman · 2010-12-15 17:08:47 6
  • Submit alternative
  • Report as malicious
  • Report as a duplicate

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yeneba6574 · 17 weeks and 5 days ago

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