I have two CSV files.

1.csv
contains:

```
46700468915;2000

```

2.csv
contains:

```
4670046;Tele2

```

I am trying to searching from 2.csv if 4670046 exists in 1.csv which is does and then take from 2.csv Tele2 and add in 1.csv if no match do not add

```
awk 'NR==FNR {a[$1]=$2; next} $2 in a {print $0, a[$2]}' OFS='\t' 2.csv 1.csv

```