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Top Forums Shell Programming and Scripting Awk Compare File1 File2 on f2 Post 302251492 by danmero on Monday 27th of October 2008 09:34:57 AM
Old 10-27-2008
Quote:
Originally Posted by RacerX
.. i really don't want to mess-up my 743,000 record database file, with something like:
Always backup your working file.

Quote:
Originally Posted by RacerX
Code:
FNR==NR { arr[$2]=$1; next}
$2 in arr { print arr[$1], $0 }

This will print only if $2 is in arr.


Quote:
Originally Posted by RacerX
Code:
if (field1 of file2) == (field2 of file1) then   #why you need this test?
awk -F: 'FNR == NR {
 { f1[$2]=$1 $2                                  # why you need the value of $2
  next;
  }
if ($2 in f1) print  f1[$1]$0; else print $0
}
' ~/Desktop/file2.txt ~/Desktop/file1.txt > ~/Desktop/outputfile.txt

 

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