needs-restarting

• https://man7.org/linux/man-pages/man1/needs-restarting.1.html

       -r, --reboothint
             Only report whether a full reboot is required (exit code
             1) or not (exit code 0).

needs-restarting -r

Related

• needrestart

See also

• reboot, poweroff, halt, ACPI, systemctl reboot, shutdown, needrestart, needs-restarting