I Need to edit message at shutting down

on solaris 8 i edited file rc0 in /sbin at last line
ex.

/sbin/sync; /sbin/sync; /sbin/sync

# Unmount file systems. /usr, /var, /var/adm, /var/run are not unmounted by
# umountall because they are mounted by rcS (for single user mode) rather than
# mountall. If this is changed, mountall, umountall and rcS should also change.

/sbin/umountall
/sbin/umount /var/adm >/dev/null 2>&1
/sbin/umount /var/run >/dev/null 2>&1
/sbin/umount /var >/dev/null 2>&1
/sbin/umount /usr >/dev/null 2>&1

echo 'The system is down.'
echo 'turn off switch now'

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this work for sol8 when i shuttting down show meassge "echo 'The system is down.'
echo 'turn off switch now'" but on Solaris 10 don't work for solution
I need to edit meassge when shutting down like sol8 Please help me

Could the unmounting of /usr/lib with env config'd for LD_LIBRARY_PATH there and not /lib (now different) be stopping the script?