Always chmod 777

akbartrinanda · 03-24-2016, 04:34 PM

How i can change /dev/ttyACM0 always rwx. If i plug off, still rwx. because i saw, if i pluged off the usb, permission changed to 640.
Please help me.

suicidaleggroll · 03-24-2016, 04:49 PM

You could set up a udev rule to change the permission of that device when it's attached. If you want more info on how to do that, you'll need to provide more info on what you're talking about.

Chances are there's a much better way of handling this problem without using chmod, but we need some context (what OS you're running, what this device is, why you need to change the permissions, what the existing ownership looks like, etc.).

John VV · 03-24-2016, 09:31 PM

it normally is a very BAD idea to run "chmod 777"

and is always the VERY LAST resort

usb drives and other internal drives are AUTO mounted as READ ONLY by design for normal users

and are mounted as READ / Write for root only

as above change the behavior for mounting the usb drive

jpollard · 03-25-2016, 12:59 PM

Quote:

Originally Posted by John VV

it normally is a very BAD idea to run "chmod 777"

and is always the VERY LAST resort

usb drives and other internal drives are AUTO mounted as READ ONLY by design for normal users

and are mounted as READ / Write for root only

as above change the behavior for mounting the usb drive

True in almost every case. Here though, it is for a usb rs232 device. And depending on its use, is still not necessarily a good idea.