Try adding quotes, like so:

$ birdc ‘show route where net ~ x.x.x.0/24 all‘

On Thu, 12 Jul 2018 at 11:35, Isaac HO <isaacho.jc@gmail.com> wrote:
sh ip bgp x.x.x.0/24 <-- Cisco

birdc show route where net ~ x.x.x.0/24 all
BIRD 1.6.4 ready.
root: variable expected. <-- Can't see any information.

May I know have any other command?

Thanks,