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Top Forums Shell Programming and Scripting Comparing two files in UNIX and create a new file similar to equi join Post 302924358 by Scrutinizer on Saturday 8th of November 2014 09:40:42 AM
Old 11-08-2014
You will find many examples in these forums for this kind of problem. In this case, you could try:
Code:
awk -F, 'NR==FNR{A[$1]=$3; next} $1 in A{$1=A[$1]}1' FS=, OFS=, file2 file1

which would produce:

Code:
WB1,Branchname1,city,country
WB2,Branchname2,city,country
WB3,Branchname3,city,country
B4,Branchname4,city,country
B5,Branchname5,city,country

or :
Code:
awk -F, 'NR==FNR{A[$1]=$3; next} $1 in A{$1=A[$1]; print}' FS=, OFS=, file2 file1

which would leave out the non-matched records:
Code:
WB1,Branchname1,city,country
WB2,Branchname2,city,country
WB3,Branchname3,city,country



--- Edit ---
There appears to be an error in the second sample file. I presume it should be:
Code:
B1,B1A1,WB1,WB1A1
B1,B1A2,WB1,WB1A2
B2,B2A1,WB2,WB2A1
B2,B2A2,WB2,WB2A2
B3,B3A1,WB3,WB3A1
B3,B3A2,WB3,WB3A2


Last edited by Scrutinizer; 11-08-2014 at 08:01 PM..
This User Gave Thanks to Scrutinizer For This Post:
 

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CountryCode(3pm)					User Contributed Perl Documentation					  CountryCode(3pm)

NAME
NCC::CountryCode - Perl extension for blah blah blah SYNOPSIS
use NCC::CountryCode; my $cc = new NCC::CountryCode(); my $cc_hash = $cc->getCCs(); print ($cc->isCC('NL')) ? "exists" : "non-existing"; $cc->CC2Country('fr'); $cc->Country2CC('russia'); DESCRIPTION
This module provides class and several methods to simplify mapping between country names and country codes, as they assigned in the ISO3166. The CC2Country() method maps country code to the corresponding country name or empty string, if it doesn't exist. The Country2CC() tries to map passed country name into country code. As the spelling of the name may vary, this function tries to find all possible matches for passed name. In array context method returns hash of country codes and names, in scalar - a string, containing all possible country codes and corresponding country names. The isCC() method verifies, that passed country code is a legal one and returns it in upper case. Otherwise it returns empty string. The getCCs() method returns the reference to the internal hash, that containes all the country codes with corresponding them country names. BUGS
In addition to the country codes defined by ISO3166 standart this module also introduce 'UK' as a synonim for 'GB' and 'EU' as additional 'virtual' name for the Europe itself. AUTHOR
Timur Bakeyev, timur@ripe.net SEE ALSO
perl(1). perl v5.10.1 2001-09-10 CountryCode(3pm)
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