root@test09 # ls -al /sbin/init
-r-xr-xr-x 1 root sys 550000 Jun 29 2002 /sbin/init
root@test09 # ls -al /usr/sbin/init
-r-xr-xr-x 1 root sys 37100 Jun 29 2002 /usr/sbin/init
what is the different ?
/sbin/init is a statically linked version - it'll work even if all (well actually most) the libraries are missing. /usr/sbin uses linked in library files (about 10 library files vs the one used by the /sbin version)
Sol10 does it all differently of course 