setserial

Read and modify serial port information. More information: https://manned.org/setserial.

• Print all information about a specific serial device:

setserial -a /dev/cuaN

• Print the configuration summary of a specific serial device (useful for printing during bootup process):

setserial -b device

• Set a specific configuration parameter to a device:

sudo setserial device parameter

• Print the configuration of a list of devices:

setserial -g device1 device2 ...