USB to COM Port connections

[Gordon Messmer]

On 05/26/2015 05:30 AM, Dave Ihnat wrote:
>> # chmod 666 /dev/ttyACM0 –>  ( Why Is this a bad syntax)
> Octal.  "chmod 0666 /dev/ttyACM0".

Those two commands are equivalent.  The leading digit is optional, and 
not an indication that the number is octal.  All numeric mode 
descriptions are octal, with or without a leading 0.  The leading digit 
may be used to specify additional permission.  If present, it "selects 
the set user ID (4) and set group ID (2) and restricted deletion or 
sticky (1) attributes."