Storing the iterations of the Receiver (or node) number and RSSI value into an CSV file

I'm quite new to Linux. Recently, I've been able to create a bash script that allows me to obtain the RSSI of the receivers (or node) with a running iteration. How can I store these results in an CSV file with a format such as: Node RSSI ... [...,...] ... [...,...] Here is what the output looks like when running the file: bash test.sh -l 170,171 -k 2 === Iteration 1 === Node RSSI ------ ---------- 170 -43 dBm 171 -43 dBm === Iteration 2 === Node RSSI ------ ---------- 170 -43 dBm 171 -44 dBm