root@OpenWrt:/bin# busybox gzip -h
gzip: illegal option -- h
BusyBox v1.4.2 (2007-05-18 16:29:27 CEST) multi-call binary

Usage: gzip [-d<delay>] [-n<nosync>] [-f<force>]

Halt the system

Options:
        -d      Delay interval for halting
        -n      No call to sync()
        -f      Force halt (don't go through init)

root@OpenWrt:/bin# ls -lh gzip
lrwxrwxrwx    1 root     root            7 May 19 18:33 gzip -> busybox
root@OpenWrt:/bin#