Getting network interface name using IP address could be accomplished by issuing:
$ ip addr show | grep "192.168.1.2" | awk '{print $7}'
or another alternative:
ifconfig | grep -B 1 "192.168.1.2" | head -n1 | awk '{print $1}'
Both command would output the name of interface such as eth0, eth1, etc.
I have LVM partition reside on my external hard drive which connected trough USB. Here's the output before I unplug the device.
$ pvs PV VG Fmt Attr PSize PFree /dev/maxtor1-40g lvm2 a- 37.27g 37.27g /dev/sde5 XENVG lvm2 a- 125.78g 121.78gWhen I unplug and plug the device I always got I/O error like this:
$ pvs /dev/dm-0: read failed after 0 of 4096 at 0: Input/output error /dev/dm-0: read failed after 0 of 4096 at 4294901760: Input/output error /dev/dm-0: read failed after 0 of 4096 at 4294959104: Input/output error /dev/dm-0: read failed after 0 of 4096 at 4096: Input/output error PV VG Fmt Attr PSize PFree /dev/maxtor1-40g lvm2 a- 37.27g 37.27g /dev/sdd5 XENVG lvm2 a- 125.78g 121.78gWell that sucks since it would become unmountable. The LVM still pointing to the old /dev/sde5 that's why the error comes.
To prevent device name changes from time to time i.e: /dev/sdc to /dev/sdd and so on a corresponding udev rules need to be created. The first step to dive into udev configuration is getting information from the device.
When having multiple gateway it is very useful know which route is used by particular address. So we can know if the routing is work as expected. For this task we can use ip route get command.
ip route get 8.8.8.8
8.8.8.8 via 192.168.42.129 dev usb0 src 192.168.42.243
cache
If you want backup entire partition the dd is a very handy tool. It let you create a snapshot of the partition and quickly restore it if you need to. No need to worry about timestamps, ownership, permissions, links, etc.