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Can you limit the compare on "comm" command

 
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Top Forums UNIX for Dummies Questions & Answers Can you limit the compare on "comm" command
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Old 03-23-2007
Can you limit the compare on "comm" command- ANSWER FOUND PLEASE IGNORE.
I need to find deleted records from a file. I compare yesterdays file.old to todays file.new. I need to find the records that were in yesterdays file that are not in todays. My file is fixed field. If I run a "comm -23" obviously what i find is not necesarilly a delete, it could be a change.

The first 10 characters of each line are always static. So my option is to cut the first 10 chars from each file into seperate fiels. COmpare these seperate files. That way I find true delete records. Problem is I need the rest of the record that I cut off. I know I can somehow creatively use awk and grep to rebuild these, but I was wondering:

Is there an option to pass to the com command to tell it to only compare the frist 10 characters of each line inmy 2 files? Thus making all the extra work not necessary.

Thank you.

I figured out a way to do this. thank you all for viewing the message.
Last edited by eja; 03-28-2007 at 11:21 AM..
 
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LEARN ABOUT DEBIAN

btarcmp

BTARCMP(1)						      General Commands Manual							BTARCMP(1)

NAME

       btarcmp - a diff for Barry tar backup files

SYNOPSIS

       btarcmp [-b][-d db][-D db][-h][-I charset][-P][-S][-v] tar0 tar1

DESCRIPTION

       btarcmp	takes  two  Barry  backup  tar	files  on the command line, and displays the differences it finds between them.  If records can be
       parsed, individual field differences are also displayed.  Added and removed records are noted.  Differences in  database  availability  are
       noted as well.  If unable to parse the records, hex dumps are used.

OPTIONS

       -b     Use brief filename markers.  Useful when tar filenames are extremely long.

       -d db  Name  of	database  to compare.  Can be used multiple times to compare multiple databases.  If not specified, all databases are com-
	      pared.

       -D db  Name of database to skip.  Can be used multiple times.  Overrides all other database selection options.

       -h     Show summary of options.

       -I charset
	      Specifies the iconv charset to use for converting international strings.	The Blackberry uses the  WINDOWS-1252  charset,  which	is
	      incompatible with the more common code pages used in Linux.  The most useful charset to use with this option is UTF-8, and is highly
	      recommended.  Any other charset available via 'iconv --list' can be used here too, but may not be successful for some character con-
	      versions.

       -S     Displays list of known database records, which can be parsed.

       -v     Verbose output, which includes record data of added and deleted records in the output.  If used twice, hex data is printed as well.

AUTHOR

       btarcmp is part of the Barry project.

SEE ALSO

       http://www.netdirect.ca/barry

								 January 20, 2010							BTARCMP(1)