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Top Forums UNIX for Dummies Questions & Answers Merging two files based on matching columns Post 302948079 by Prathmesh on Thursday 25th of June 2015 01:28:01 PM
Old 06-25-2015
Merging two files based on matching columns

Hi,

I am facing issues while accomplishing below task.

We have two files Test1.txt and Test2.txt. We have to match 1st column of Test1.txt file with 2nd column of Test2.txt and then merge 2nd file with the 1st file. In the output we should select column 1 and 2 from the 1st file and column 1 and 3 from the 2nd file. If there is no match with the 1st file then blank should be appended in output.
Code:
$ cat Test1.txt
Amar,Movies,12
Sanjay,Cricket,18
Rakesh,Football,35
Samit,Cricket,56
Sam,Songs,20
Ram,Books,40
$

Code:
$ cat Test2.txt
1,Samit,Service
2,Sam,DJ
3,Rakesh,Police
$

Desired Output:
Code:
Amar,Movies,,
Sanjay,Cricket,,
Rakesh,Football,3,Police
Samit,Cricket,1,Service
Sam,Songs,2,DJ
Ram,Books,,

I have tried to do this with awk but, could not get it.

Also, please advise how can we represent individual fields from two files?
For example, if I pass two files (Test1.txt and Test2.txt) to awk then, how will I differentiate or represent 1st/2nd field of the Test1.txt and 1st/2nd field of the Test2.txt?

Thanks in advance for your help in this regards.
 

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NUMSUM(1)						User Contributed Perl Documentation						 NUMSUM(1)

NAME
numsum - numsum program file SYNOPSIS
numsum [-iIcdhrsvxy] <FILE> | numsum [-iIcdhrsvxy] (Input on STDIN from pipeline.) numsum [-iIcdhrsvxy] (Input on STDIN. Use Ctrl-D to stop.) DESCRIPTION
numsum will take all the numbers on stdin and return the sum of those numbers. Currently it only processes the first number on each line. Besides positive numbers, it also handles negative numbers and numbers with decimals. OPTIONS
-i Only return the integer portion of the final sum. -I Only return the decimal portion of the final sum. -c Print out the sum of each column. -r Print out the sum of each row. -x <n> Specify a comma seperated list of columns to print. -y <n> Specify a comma seperated list of rows to print. -s <string> Specify a string to use as a seperator for columns. This defaults to be consecutive whitespace (s+). -h Help: You're looking at it. -V Increase verbosity. -d Debug mode. For developers -q Quiet mode, don't print any warnings. EXAMPLES
Simply add up the numbers in a file. $ numsum numbers.txt 4315 Enter your own numbers on STDIN. The last number is the answer. $ numsum 4 21 98 100 223 Use it in a command pipeline. $ ls -1s | grep .mp3 | numsum -c -x 5 72288 Add up the total byte count in a http log file. $ cat access_log | awk {'print $10'} numsum or numsum -c -x 10 access_log Add up the columns of numbers of a file. $ cat columns 1 6 11 16 21 2 7 12 17 22 3 8 13 18 23 4 9 14 19 24 5 10 15 20 25 $ numsum -c columns 15 40 65 90 115 Add up the 1st, 2nd and 5th columns only. $ numsum -c -x 1,2,5 columns 15 40 115 Add up the rows of numbers of a file. $ numsum -r columns 55 60 65 70 75 Add up the 2nd and 4th rows. $ numsum -r -y 2,4 columns 60 70 SEE ALSO
numaverage(1), numbound(1), numinterval(1), numnormalize(1), numgrep(1), numprocess(1), numrandom(1), numrange(1), numround(1) COPYRIGHT
numsum is part of the num-utils package, which is copyrighted by Suso Banderas and released under the GPL license. Please read the COPYING and LICENSE files that came with the num-utils package Developers can read the GOALS file and contact me about providing submitions or help for the project. MORE INFO
More info on numsum can be found at: http://suso.suso.org/programs/num-utils/ perl v5.10.1 2009-10-31 NUMSUM(1)
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