Question

I am trying to join 2 files together – both files are in CSV format – both files have the same columns. Here is an example of each file :

File 1:

CustName,AccountReference,InvoiceDate,InvoiceRefID,TelNo,Rental,GPRS,Mnet,MnetPlus,SMS,CSD,IntRoaming,NetAmount
acme,107309   ,2011-09-24 12:47:11.000,AP/157371,07741992165     ,2.3900,.0000,.0000,.0000,.0000,.0000,.0000,2.3900
acme,107309   ,2011-09-24 12:58:32.000,AP/162874,07740992165     ,2.0000,.0000,.0000,.0000,.0000,.0000,.0000,2.0000
anot,107308   ,2011-09-24 12:58:32.000,AP/162874,07824912428     ,2.0000,.0000,.0000,.0000,.0000,.0000,.0000,2.0000
anot,107308   ,2011-09-24 12:47:11.000,AP/157371,07834919928     ,1.5500,.0000,.0000,.0000,.0000,.0000,.0000,1.5500

File 2:

CustName,AccountReference,InvoiceDate,InvoiceRefID,TelNo,Rental,GPRS,Mnet,MnetPlus,SMS,CSD,IntRoaming,NetAmount
acme,100046,2011-10-05 08:29:19,AB/020152,07824352342,12.77,0.00,0.00,0.00,0.00,0.00,0.00,12.77
anbe,100046,2011-10-05 08:29:19,AB/020152,07741992165,2.50,0.00,0.00,0.00,0.00,0.00,0.00,2.50
acve,100046,2011-10-05 08:29:19,AB/020152,07740992165,10.00,0.00,0.00,0.00,0.00,0.00,0.00,10.00
asce,100046,2011-10-05 08:29:19,AB/020152,07771335702,2.50,0.00,0.00,0.00,0.00,0.00,0.00,2.50

I would like to join the 2 files together – but just taking some of the columns the other columns can be ignored (some are the same, some are different) –

AccountRef,telno, rental_file1,rental_file2,gprs_file1,gprs_file2 etc etc ….

The join should be done on the telno column (it seems I have white space in file 1 – hope that can be ignored ?

i have found lots of examples using JOIN but all of them use the first column for the key on the join …. any pointers would be great – thanks

Answer 1

awk -F' *, *' 'NR > 1 && NR == FNR {
  _[$5] = $0; next
  }  
NR == 1 {
  print "AccountReference", "TelNo", "Rental_" ARGV[2], \
  "Rental_" ARGV[3], "GPRS_" ARGV[2], "GPRS_" ARGV[3]
  next
  }
$5 in _ {
  split(_[$5], t)
  print $2, $5, $6, t[6], $7, t[7]
  }' OFS=, file2 file1