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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 ...}}