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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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XZDIFF(1)							     XZ Utils								 XZDIFF(1)

NAME
xzcmp, xzdiff, lzcmp, lzdiff - compare compressed files SYNOPSIS
xzcmp [cmp_options] file1 [file2] xzdiff [diff_options] file1 [file2] lzcmp [cmp_options] file1 [file2] lzdiff [diff_options] file1 [file2] DESCRIPTION
xzcmp and xzdiff invoke cmp(1) or diff(1) on files compressed with xz(1), lzma(1), gzip(1), or bzip2(1). All options specified are passed directly to cmp(1) or diff(1). If only one file is specified, then the files compared are file1 (which must have a suffix of a supported compression format) and file1 from which the compression format suffix has been stripped. If two files are specified, then they are uncom- pressed if necessary and fed to cmp(1) or diff(1). The exit status from cmp(1) or diff(1) is preserved. The names lzcmp and lzdiff are provided for backward compatibility with LZMA Utils. SEE ALSO
cmp(1), diff(1), xz(1), gzip(1), bzip2(1), zdiff(1) BUGS
Messages from the cmp(1) or diff(1) programs refer to temporary filenames instead of those specified. Tukaani 2010-09-27 XZDIFF(1)
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