Re: Resetting a USB port in Debian 10

[Greg Wooledge <greg@wooledge.org>]

On Thu, May 19, 2022 at 06:24:21PM +0100, Tixy wrote:
> On Thu, 2022-05-19 at 07:00 -0400, Greg Wooledge wrote:
> > 1) For ** to work, you need to do "shopt -s globstar" somewhere before it.
> 
> I didn't know that, it works for me without setting that option.
> 
> $ shopt | grep globstar
> globstar       	off
> $ echo /sys/bus/usb/drivers/usb/**/serial
> /sys/bus/usb/drivers/usb/usb1/serial
> /sys/bus/usb/drivers/usb/usb2/serial
> /sys/bus/usb/drivers/usb/usb3/serial
> /sys/bus/usb/drivers/usb/usb4/serial

You're getting the exact same results you'd get from
/sys/bus/usb/drivers/usb/*/serial

unicorn:~$ bash
unicorn:~$ mkdir -p /tmp/x/y/z/foo.txt
unicorn:~$ echo /tmp/**/*.txt
/tmp/dumps/greg_log.txt
unicorn:~$ shopt -s globstar
unicorn:~$ echo /tmp/**/*.txt
/tmp/dumps/greg_log.txt /tmp/x/y/z/foo.txt

With globstar on, ** and * become different.