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Top Forums Shell Programming and Scripting Compare two files and output diff to third file Post 302239899 by jim mcnamara on Wednesday 24th of September 2008 04:39:03 PM
You want the output of records that are unique to file1.
assuming both files have a record layout of ie., a single column
awk 'FILENAME=="file1" { if( $0 in arr) {continue} else {print $0 } }
      FILENAME=="file2" {arr[$0]++ }'  file2 file1

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BZDIFF(1)						      General Commands Manual							 BZDIFF(1)

bzcmp, bzdiff - compare bzip2 compressed files SYNOPSIS
bzcmp [ cmp_options ] file1 [ file2 ] bzdiff [ diff_options ] file1 [ file2 ] DESCRIPTION
Bzcmp and bzdiff are used to invoke the cmp or the diff program on bzip2 compressed files. All options specified are passed directly to cmp or diff. If only 1 file is specified, then the files compared are file1 and an uncompressed file1.bz2. If two files are specified, then they are uncompressed if necessary and fed to cmp or diff. The exit status from cmp or diff is preserved. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +--------------------+-----------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +--------------------+-----------------+ |Availability | SUNWbzip | +--------------------+-----------------+ |Interface Stability | Committed | +--------------------+-----------------+ SEE ALSO
cmp(1), diff(1), bzmore(1), bzless(1), bzgrep(1), bzip2(1) BUGS
Messages from the cmp or diff programs refer to temporary filenames instead of those specified. BZDIFF(1)

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