[lekernel@localhost ~]$ fuser /dev/ttyUSB0
/dev/ttyUSB0:         5578
[lekernel@localhost ~]$ fuser /dev/ttyUSB0
/dev/ttyUSB0:         5578
[lekernel@localhost ~]$ fuser /dev/ttyUSB0
/dev/ttyUSB0:         5581
[lekernel@localhost ~]$ fuser /dev/ttyUSB0
/dev/ttyUSB0:         5581
[lekernel@localhost ~]$ fuser /dev/ttyUSB0
/dev/ttyUSB0:         5584
[lekernel@localhost ~]$ fuser /dev/ttyUSB0
/dev/ttyUSB0:         5586
[lekernel@localhost ~]$ fuser /dev/ttyUSB0
/dev/ttyUSB0:         5588