Comparing two files in UNIX and create a new file similar to equi join


 
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Top Forums Shell Programming and Scripting Comparing two files in UNIX and create a new file similar to equi join
# 1  
Old 11-08-2014
Comparing two files in UNIX and create a new file similar to equi join

I have 2 files namely branch.txt file & RXD.txt file as below

Ex:Branch.txt
=========================
Code:
   B1,Branchname1,city,country
   B2,Branchname2,city,country
   B3,Branchname3,city,country
   B4,Branchname4,city,country
   B5,Branchname5,city,country

RXD file : will contain old branch code, old accountid, new branch code and new Accountid.
========

RXD.txt
===============
Code:
   B1,B1A1,WB1,WB1A1
   B1,B1A2,WB1,WB1A2
   B2,B2A1,WB2,WB2A1
   B2,B2A2,WB2,WB2A2
   B3,B3A1,WB3,WB3A1
   B1,B3A2,WB3,WB3A2

We need to compare old branch codes in the abv 2 files and create a new newBranchfilter.txt with new branch code (Similar to oracle equi join)

newBranchfilter.txt
=================
Code:
   WB1,Branchname1,city,country
   WB2,Branchname2,city,country
   WB3,Branchname3,city,country

Im new to Unix shell scripting..can anyone help me to solve this using unix shell script.
Thank you!


Moderator's Comments:
Mod Comment Please use code tags next time for your code and data. Thanks

Last edited by vbe; 11-08-2014 at 08:53 AM..
# 2  
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:
# 3  
Old 11-19-2014
Hi Scrutinizer,
Code:
awk -F, 'NR==FNR{A[$1]=$3; next} $1 in A{$1=A[$1]; print}' FS=, OFS=, file2 file1

is working perfectly. Can you please explain the command and its working?

Thanks,
satece

Last edited by Franklin52; 11-19-2014 at 12:16 PM.. Reason: Please use code tags
# 4  
Old 11-19-2014
Please use code tags as required by forum rules!

Code:
awk -F,                         # run awk and set field separator char
'                               # quote the entire script
NR==FNR {A[$1]=$3; next}        # for the first file, i.e. the file's line no. equals the overall line no., keep field 3 in array A indexed by field 1, stop processing this line, jump to next line
 $1 in A {$1=A[$1];             #  if field 1 points to an entry in A, replace it by that A entry's  contents
          print}                # and print this line
'                               # quote the entire script
FS=,                            # set field sep. again (pointless)
OFS=,                           # set output field sep.
file2                           #read and process file 2 first
file1                           # process file2

This User Gave Thanks to RudiC For This Post:
# 5  
Old 02-05-2015
Hi,

Similar to the above post, we are filtering the lines based on the 2 columns.

Input file1

Code:
a1,b1,1
a2,b2,2
a3,b4,3
a4,b3,4

Input file2
Code:
5,a1,b1
6,a2,b2
7,a3,b3
8,a4,b4

The requirement is to filter the records from the file1 when col1 and col2 of file1 matches with col2 and col3 of file 2 respectively.

when tried with the following awk command:

Code:
awk -F',' -v OFS=',' 'NR==FNR{a[$2FS$3]=$1;next} $1FS$2 in a{print $0} file2 file1

we got the output:
Code:
a1,b1,1
a2,b2,2
a3,b4,3

But the expected output is:
Code:
a1,b1,1
a2,b2,2

Please guide.

Last edited by Scrutinizer; 02-05-2015 at 07:26 AM.. Reason: code tags
# 6  
Old 02-05-2015
Code:
[akshay@localhost tmp]$ cat f1
a1,b1,1
a2,b2,2
a3,b4,3
a4,b3,4

Code:
[akshay@localhost tmp]$ cat f2
5,a1,b1
6,a2,b2
7,a3,b3
8,a4,b4

Code:
$ awk -F, 'FNR==NR{a[$2,$3];next}($1,$2) in a'  f2 f1
a1,b1,1
a2,b2,2


OR


Code:
[akshay@localhost tmp]$ awk -F, 'FNR==NR{a[$1,$2]=$0;next}($2,$3) in a{print a[$2,$3]}'   f1 f2
a1,b1,1
a2,b2,2

--edit--

Code:
awk -F, '
          # Here we read file1 (f1)
	  # FNR == NR only while reading first file

	  FNR==NR{
		   # We are interested in comparing
		   # Column1 and Column2 of file1 with
		   # Column2 and Column3 of file2, So
		   # here we create index Column1,Column2 ($1,$2)
                   # and its saved in array "a" where array value
		   # will be record of file1

		   a[$1,$2]=$0

		   # The next statement forces awk to 
		   # immediately stop processing the current record and go on to the next record

		   next
		 }

         # Here we read file2 (f2)
	 # again here we create index using column2 and column3 ($2,$3) of file2
	 # if index exists in array "a" we created above
	 # then print array value

     ($2,$3) in a{
		   print a[$2,$3]
		 }
       '   f1 f2

-F, -> Field separator is set to comma

Last edited by Akshay Hegde; 02-05-2015 at 06:01 AM..
# 7  
Old 02-05-2015
Hi Akshay,

Thanks for the quick help. But facing the same problem.
Getting the output as:
Code:
a1,b1,1
a2,b2,2
a3,b4,3

Please suggest.

Last edited by Scrutinizer; 02-05-2015 at 07:27 AM..
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