udevd

root@OpenWrt:/sbin# ls
devstatus          insmod             procd              sysupgrade
firstboot          klogd              reboot             ubusd
fw                 led.sh             rmmod              uci
halt               logread            rngd               udevadm
hotplug-call       lsmod              route              udevd
hotplug2           luci-reload        start-stop-daemon  udevtrigger
hwclock            mkswap             swapoff            udhcpc
ifconfig           mount_root         swapon             vconfig
ifdown             mtd                swconfig           watchdog
ifstatus           netifd             switch_root        wifi
ifup               pivot_root         sysctl
init               poweroff           syslogd
root@OpenWrt:/sbin# udevd
bind failed: No such file or directory
error binding udev control socket
error binding udev control socket
root@OpenWrt:/sbin#

root@OpenWrt:~# ls /usr/bin
[                 dropbearkey       md5sum            strings
[[                du                mkfifo            tail
arping            env               mmcli             tee
awk               expr              nc                telnet
basename          find              nslookup          test
bunzip2           free              passwd            time
bzcat             gcom              pgrep             top
clear             head              printf            tr
cmp               hexdump           qmi-network       traceroute
comgt             hostid            qmicli            uniq
crontab           id                readlink          uptime
cut               jshn              reset             usb_modeswitch
dbclient          killall           rngtest           wc
dbus-launch       less              scp               wget
dbus-launch.real  logger            seq               which
dbus-uuidgen      lua               sort              xargs
dirname           luci-bwc          ssh               yes

root@OpenWrt:~# ls /usr/sbin
ModemManager      dbus-daemon       iptables-restore  pppd
brctl             dnsmasq           iptables-save     telnetd
chat              dropbear          iw                uhttpd
chroot            hostapd           maccalc           wpa_supplicant
crond             iptables          ntpd              wpad