I recently added a Huawei E220 on to my Linux box. That broke my backup because it used /dev/cdrom -> /dev/hdc, which got changed to /dev/sr0 I've altered /etc/udev/rules.d/70-persistent-cd.rules thus:
I've had to reboot after making these changes. In the past I've been able to run 'udevstart', but this no longer exists on my system. How can I recreate/debug my udev without rebooting? udev seems to be a bit of a moving target.

I use udev-146-r1 on Gentoo.

Yes, udev is a moving target for sure; however you should still have a udev tool on the system, or a related script, which will do one or more of several things, including stopping, starting/restarting udevd, as well as things like reloading rules and/or force-reloading the rules and repopulating /dev.

I'm not familiar with Gentoo, but on my Slackware system, I use an rc script called rc.udev. I don't believe you have such a script, so look for a binary called "udevadm" which IIRC does similar things. There may also be a binary called "udevmonitor" or "udev-monitor" which is intended to give you console output of udev events while you are debugging.

What I would do, is use `find` or `locate` to locate any/all udev* binaries and scripts on your machine, probably in /bin or /sbin or /usr/sbin or /usr/bin or /lib/udev or wherever, and then check out the man page for each tool (they do actually have man pages for the binary tools) and go from there.

Best regards,
Sasha

Thanks. After a while I discovered: