or, without additional software packages, just echo -e "AT+QCFG=\"band\",0,2000000003300185a,1\r\n" > /dev/ttyUSB2 (for example)
echo -e "AT+QCFG=\"band\",0,2000000003300185a,1\r\n" > /dev/ttyUSB2
To read responses, you’ll need to listen to the same interface in another terminal session.