On Linux in the Bash you have two commands for this

(sudo) mokutil – -sb-state

or

bootctl status | grep „Secure Boot“ 2

If you don’t want to see the error messages, then you can do

bootctl status 2>/dev/null | grep „Secure Boot“

Attention:

bootctl status | grep „Secure Boot“ 2 >/dev/null

does not work.