#DFIR tip:
When dealing with CSV files, you can usually avoid Excel & custom scripts when just filtering for particular columns:
$ echo "a,b,c,d,e" | cut -d , -f 1,2
a,b
$ echo "a,b,c,d,e" | cut -d , -f 1-3,5
a,b,c,e
$ echo "a,b,c,d,e" | cut -d , -f 3-
c,d,e