Compare 2 files and delete the lines that match criteria using awk / sed /bash

Question

I am new to awk and sed and have the below requirement.

Below is the file data

Old File :

SNO,ID,SHAPE,COST,CURRENTCOST
1,ABC,EFG,123,123
2,EEC,EFG,123,12
3,ARR,EFG,123,12

New File :

SNO,ID,SHAPE,COST,CURRENTCOST
1,ABC,EFG,123,0
2,EEC,EFG,123,12
3,ARR,EFG,123,12 

Expected output File :

SNO,ID,SHAPE,COST,CURRENTCOST
2,EEC,EFG,123,12
3,ARR,EFG,123,12

Firstly , I would like compare the ID's and if they match CHECK IF CURRENTCOST(5th Column ) is 0 , if it is 0 , then delete the line from New file

Below is the code flow

if(CURRENTCOST == 0)
THEN 
  IF(FIRST FILE ID == SECOND FILE ID)
     THEN DELETE THE LINE FROM SECOND FILE 
  ELSE
     DO NOTHING

Also , I can skip copying that line if the condition is true and copy other lines to a new file

Hope this helps.

Thanks Tejas

Answer 1

Using awk you can do this:

awk -F, 'NR == FNR {a[$1]=$5; next} !($1 in a && $5 == 0)' oldFile newFile

SNO,ID,SHAPE,COST,CURRENTCOST
2,EEC,EFG,123,12
3,ARR,EFG,123,12

Answer 2

grep -v '0$' newFile  | join -t , -o 2.{1..5} oldFile -

1. remove the unwanted line from the newFile
2. join oldfile with modified content from stdin
3. select columns from newfile only