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Full Discussion: Not sure how to use diff and comm for my problem
Top Forums UNIX for Dummies Questions & Answers Not sure how to use diff and comm for my problem Post 302295351 by InfoSeeker on Saturday 7th of March 2009 02:43:14 PM
Old 03-07-2009
Java Not sure how to use diff and comm for my problem
Hello,
Apologies if this question has been repeated before, but I am getting myself confused even more as I scan the posts!

I have two files, file1 is a column:
1dlwa_
1s69a_
1idra_
1ngka_

And file2 has three columns (columns seperated by tabs):
1dlw a_ A
1uvy a_ A
1dly a_ A
1uvx a_ A
1s69 a_ A

I want to only extract from file2 those rows where the first & second column concatenated together matches the first column of file1. In this example above, I would only want to see:
1dlw a_ A
1s69 a_ A

And I want to save these in a new file, file3. How would I use diff, comm, or any combination of those to do it?
Thank you in advance for your help!
InfoSeeker
 

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LEARN ABOUT LINUX

xzdiff

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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