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Full Discussion: Compare 2 csv files by columns, then extract certain columns of matcing rows
Top Forums Shell Programming and Scripting Compare 2 csv files by columns, then extract certain columns of matcing rows Post 302904407 by bkane3 on Wednesday 4th of June 2014 04:06:53 AM
Old 06-04-2014
Thanks this works with the following examples files. However, it's been 4 hours since I've started running on the actual files I have, and it still has not finished. The actual file3 I have is about 16GB, and the actual file4 is only 2KB. Is there ways to make the program faster? maybe a way to program it without the loop?

Code:
 cat file3.csv
id,chain,dept,category,company,brand,date,productsize,productmeasure,purchasequantity,purchaseamount,offer,market,repeattrips,repeater,offerdate
86246,205,7,707,1078778070,12564,2012-03-02,12,OZ,1,7.59,1208251,34,5,t,2013-04-24
86246,205,63,6319,107654575,17876,2012-03-02,64,OZ,1,1.59,1208251,34,5,t,2013-04-24
86246,205,97,9753,1022027929,0,2012-03-02,1,CT,1,5.99,1208251,34,5,t,2013-04-24
86246,205,25,2509,107996777,31373,2012-03-02,16,OZ,1,1.99,1208251,34,5,t,2013-04-24
86246,205,55,5558,107684070,32094,2012-03-02,16,OZ,2,10.38,1208251,34,5,t,2013-04-24
86246,205,97,9753,1021015020,0,2012-03-02,1,CT,1,7.8,1208251,34,5,t,2013-04-24
86246,205,99,9909,107127979,6732,2012-03-02,16,OZ,1,2.49,1194044,34,5,t,2013-04-24
86246,205,59,5907,102900020,2012,2012-03-02,16,OZ,1,1.39,1208251,34,5,t,2013-04-24
86246,205,9,9909,107127979,9209,2012-03-02,4,OZ,2,1.5,1194044,34,5,t,2013-04-24

Code:
$ cat file4.csv
offer,category,quantity,company,offervalue,brand
1190530,9115,1,108500080,5,93904
1194044,9909,1,107127979,1,6732
1197502,3203,1,106414464,0.75,13474
1198271,5558,1,107120272,1.5,5072
1198272,5558,1,107120272,1.5,5072
1198273,5558,1,107120272,1.5,5072
1198274,5558,1,107120272,1.5,5072
1198275,5558,1,107120272,1.5,5072
1199256,4401,1,105100050,2,13791

and the result:
Code:
offer,category,quantity,company,offervalue,brand,id,chain,dept,date,productsize,productmeasure,purchasequantity,purchaseamount,market,repeattrips,repeater,offerdate
1194044,9909,1,107127979,1,6732,86246,205,99,2012-03-02,16,OZ,1,2.49,34,5,t,2013-04-24

 

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LEARN ABOUT OPENDARWIN

column

COLUMN(1)						    BSD General Commands Manual 						 COLUMN(1)

NAME

     column -- columnate lists

SYNOPSIS

     column [-tx] [-c columns] [-s sep] [file ...]

DESCRIPTION

     The column utility formats its input into multiple columns.  Rows are filled before columns.  Input is taken from file operands, or, by
     default, from the standard input.	Empty lines are ignored.

     The options are as follows:

     -c      Output is formatted for a display columns wide.

     -s      Specify a set of characters to be used to delimit columns for the -t option.

     -t      Determine the number of columns the input contains and create a table.  Columns are delimited with whitespace, by default, or with
	     the characters supplied using the -s option.  Useful for pretty-printing displays.

     -x      Fill columns before filling rows.

DIAGNOSTICS

     The column utility exits 0 on success, and >0 if an error occurs.

ENVIRONMENT

     COLUMNS  The environment variable COLUMNS is used to determine the size of the screen if no other information is available.

EXAMPLES

	   (printf "PERM LINKS OWNER GROUP SIZE MONTH DAY " ; 
	   printf "HH:MM/YEAR NAME
" ; 
	   ls -l | sed 1d) | column -t

SEE ALSO

     colrm(1), ls(1), paste(1), sort(1)

HISTORY

     The column command appeared in 4.3BSD-Reno.

BSD
								   June 6, 1993 							       BSD
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