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[OT] Resetting a serial port

Is there a way to reset a serial port without rebooting,
(something like unplugging and replugging a USB device)?  Just
this morning my modem appeared to go dead.  Despite trying out
other programs like efax or minicom, aside from the usual pppd, I
couldn't get the modem to return so much as a fax tone.  In
desperation I decided to reboot and voila, I could use my modem

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