How to know the network name

[Jerry Geis]

On Sat, Oct 23, 2021 at 2:38 PM Little Girl <littlergirl at gmail.com> wrote:

> Hey there,
>
> Jerry Geis wrote:
>
> >I need to know the correct ens4 type network name so when the
> >machine reboots and tries to install Ubuntu 20.04 with a static
> >address - all is correct. How do I get  that name?
>
> This command will give it to you, although it's at least a little bit
> clumsy and could be done more elegantly:
>
> ip address | grep "BROADCAST" | cut -d' ' -f2 | cut -d':' -f1
>
> How the command works:
>         * The ip address command gets your network
>           configuration and passes it to the grep command.
>         * The grep command searches for BROADCAST and finds a line of
>           content containing the search term. It passes its findings
>           to the first cut command.
>         * The first cut command removes all but the second field,
>           which is your iface plus a colon after it. It passes its
>           result to the next cut command.
>         * The next cut command removes all but the first field, so it
>           removes the colon and leaves you with your iface.
>
> Those last two cuts are the clumsy part that someone more well-versed
> in Bash could probably rewrite into one step.
>
> --
> Little Girl
>
> There is no spoon.
>
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This is useful "after" ubuntu is installed...  I am "converting" a centOS
machine with network names like eth0 and eth1 - which is what your command
prints to the screen.
I need to know a command I can run on CentOS that will tell me what the
ubuntu netowrk name will be bill.   like in this case I did manually eth0
gets renamed to ens3 or eth1 gets renames to ens4.
I need to build that Ubuntu grub kernel install line with the correct
network name so when I reboot from centos into ubuntu - hte correct network
name is given.

Thanks,

Jerry
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