setserial: add page (#9291)

pages/linux/setserial.md

@@ -0,0 +1,20 @@
+# 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 ...}}`