Nested For Loop in Batch

Question

Ive look over many threads and cannot seem to put together a solution to my problem.

What i would like to do is use two lists to create one output.

set Client_ID=BJCH,BORG,FGMS,SVIN,JEFF,NWIL
set PartNo=1,2,9,10,12,20

for %%A in (%Client_ID%) do (
    for %%B in (%PartNo%) do (
        echo %%A %%B 

        )
)

But the output I get is:

BJCH 1
BJCH 2
BJCH 9
BJCH 10
BJCH 12
BJCH 20
BORG 1
BORG 2
BORG 9
BORG 10
BORG 12
BORG 20
FGMS 1
FGMS 2
FGMS 9
etc........

What i need is

BJCH 1
BORG 2
FGMS 9
SVIN 10
JEFF 12
NWIL 20

Any idea what I'm doing wrong? Any help is much appreciated.

Answer 1

Your two lists are separated ones: if you nest one for into the other one, you are multiplying the number of results. There is no way to process both lists in the same for, unless you convert the lists into two arrays and then process both arrays in the same for, that is, process the elements of the two arrays with same index. For example:

setlocal EnableDelayedExpansion

set Client_ID[1]=BJCH
set Client_ID[2]=BORG
etc...

set PartNo[1]=1
set PartNo[2]=2
etc...

for /L %%i in (1,1,6) do echo !Client_ID[%%i]! !PartNo[%%i]!

You may also simulate previous processing ("two elements with same index") this way:

@echo off
setlocal EnableDelayedExpansion

set Client_ID=BJCH,BORG,FGMS,SVIN,JEFF,NWIL
set PartNo=1,2,9,10,12,20

set i=0
for %%A in (%Client_ID%) do (
   set /A i+=1, j=0
   for %%B in (%PartNo%) do (
      set /A j+=1
      if !i! equ !j! echo %%A %%B 
   )
)

EDIT: Output example added

BJCH 1
BORG 2
FGMS 9
SVIN 10
JEFF 12
NWIL 20