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Top Forums UNIX for Dummies Questions & Answers Finding names in multiple files - second attempt Post 302297094 by jim mcnamara on Thursday 12th of March 2009 01:12:00 PM
Old 03-12-2009
Use associative arrays in awk. This finds names that occur in both files. It is case-sensitive and sensitive to extra spaces - in other words an exact match
Code:
awl '{ if(FILENAME=="file1") (arr[$0]++}
        if(FILENAME=="file2") {if($0 in arr) {print $0)} }
      }'  file1 file2

Nested loops like you describe take far too long. This is about as godd as it gets.
 

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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 xdiff 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 or diff. If only one file is specified, then the files compared are file1 (which must have a suffix of a supported com- pression 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 or diff 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 2009-07-05 XZDIFF(1)
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