I tried that :(FILESYSTEM is suppose to check devices as well.  But is ttyUSB0 
too devicie?

    On Monday, 29 July 2019, 04:12:14 pm ACST, Phil Townes 
<[email protected]> wrote:  
 
 Hi Tony,
Have you tried FILE, instead of FILESYSTEM?
check file USB_Serial0 with path /dev/ttyUSB0
    if not exist then alertCheers!Phil

On Mon, 29 Jul 2019 at 06:58, Tony Eyles <[email protected]> wrote:

Is there a way to check if a device is available?For example checking if a USB 
Serial device shown in the system as /dev/ttyUSB0 is actively seen by the 
system?
I have tried
# check for USB serial adaptor as USB0check filesystem USB_Serial0 path 
/dev/ttyUSB0    if changed fsflags  then alert
and
# check for USB serial adaptor as USB0check filesystem USB_Serial0 path 
/dev/ttyUSB0    if not exist then alert


Tony
  

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