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Full Discussion: How to diff to get only matching results?
Top Forums UNIX for Dummies Questions & Answers How to diff to get only matching results? Post 302923252 by junior-helper on Friday 31st of October 2014 01:40:17 PM
Old 10-31-2014
DallasT,
the answer to your last question seems to be "it depends", respectively "yes and no". Somehow the order of the files seems to matter (same applies to the second grep approach):
Code:
$ grep -f <(tr ',' '\n' < file1) <(tr ',' '\n' <file2)
 rex
 abc
 123
$ grep -f <(tr ',' '\n' < file2) <(tr ',' '\n' <file1)
 123
 rex
$

If you're working with Linux and GNU sed, following might be a viable solution:
Code:
sed 's/, /\n/g' fileA fileB | sort | uniq -d

 

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LEARN ABOUT POSIX

zgrep

ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep	options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other options specified are passed directly to grep.  If no file is specified,  then  the
       standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and fed to grep.

       If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

																	  ZGREP(1)
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