statserial(1) on Linux
The text eaefbe314764, as Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 5.0 (Lenny), Debian 4.0 (Etch), Debian 3.1 (Sarge) shipped it.
display serial port modem status lines
Flags it lists
-
-d -
-n -
-x