It is right there in the documentation:
https://bird.network.cz/?get_doc&v=20&f=bird-4.html#cli-down

down
Shut BIRD down.

On Sat, Mar 21, 2020 at 11:49 PM Fabiano D'Agostino
<fabiano.dagostino96@gmail.com> wrote:
>
> I am using Bird 2.0.7 and I didn't find any way to stop the process, I mean I didn't find any command
>
> Il giorno sab 21 mar 2020 alle ore 22:28 Alexander Zubkov <green@qrator.net> ha scritto:
>>
>> You can send it a command to shut down itself, or you can send some
>> signals to the process kill TERM or even KILL.
>>
>> On Sat, Mar 21, 2020 at 8:43 PM Fabiano D'Agostino
>> <fabiano.dagostino96@gmail.com> wrote:
>> >
>> > Good evening Alexander,
>> > the directory exists, how can I stop the other bird process?
>> >
>> > Il giorno sab 21 mar 2020 alle ore 20:00 Alexander Zubkov <green@qrator.net> ha scritto:
>> >>
>> >> Hello,
>> >>
>> >> You probably have another bird process running already. Also ensure
>> >> that /usr/local/var/run/ exists with proper permissions.
>> >>
>> >> On Sat, Mar 21, 2020 at 7:31 PM Fabiano D'Agostino
>> >> <fabiano.dagostino96@gmail.com> wrote:
>> >> >
>> >> > According to the documentation the socket is in  prefix/var/run/bird.ctl
>> >> > Anyway if I run bird I get this error:Cannot create control socket Address already in use
>> >> >
>> >> > Il giorno sab 21 mar 2020 alle ore 15:35 Fabiano D'Agostino <fabiano.dagostino96@gmail.com> ha scritto:
>> >> >>
>> >> >> Hi Martin,
>> >> >> my socket is at /usr/local/var/run/. I am running bird on a VM, the first time I run Bird it worked, but then I reboot my VM and now I get this error..
>> >> >>
>> >> >> Thanks,
>> >> >>
>> >> >> Il giorno sab 21 mar 2020 alle ore 15:28 Martin Weinelt <martin@darmstadt.freifunk.net> ha scritto:
>> >> >>>
>> >> >>> Hi Fabiano,
>> >> >>>
>> >> >>> you need to specify the correct path your the control socket via `birdc
>> >> >>> -s <path>`. You apparently built your bird with PREFIX=/usr/local but
>> >> >>> the control socket is not there. Have you checked whether it is at
>> >> >>> `/run/bird.ctl` instead?
>> >> >>>
>> >> >>> Best,
>> >> >>>
>> >> >>> Martin
>> >> >>>
>> >> >>> On 3/21/20 2:59 PM, Fabiano D'Agostino wrote:
>> >> >>> > Hi all,
>> >> >>> > which is the proper way to start Bird?
>> >> >>> > I edited the bird.conf and now I am getting this error when I lunch birdc:
>> >> >>> > Unable to connect to server control socket
>> >> >>> > (/usr/local/var/run/bird.ctl): Connection refused
>> >> >>> > I also did bird -p
>> >> >>> >
>> >> >>> > Thanks,
>> >> >>> >
>> >> >>> > Fabiano
>> >> >>>