Power down with a one-time forced hibernate in OS X

hibernate.sh

# Before using this script, see output of pmset -g and note the value
# of hibernatemode.
pmset -g

# Save to disk, per pmset(1):
#
# hibernatemode = 25 (binary 0001 1001) is only settable via pmset. The
# system will store a copy of memory to persistent storage (the disk), and
# will remove power to memory. The system will restore from disk image.
sudo pmset -a hibernatemode 25

# Power down right now.
sudo pmset sleepnow

# Back to normal for desktops (use whatever pmset -g was set to earlier)
sudo pmset -a hibernatemode 0