シャットダウンプロセス

bash# shutdown -h now

# Set the path.
PATH=/sbin:/etc:/bin:/usr/bin

# If there are SystemV init scripts for this runlevel, run them.
if [ -x /etc/rc.d/rc.sysvinit ]; then
  . /etc/rc.d/rc.sysvinit
fi

# Set linefeed mode to avoid staircase effect.
stty onlcr

# Find out how we were called.
case "$0" in
	*0)
		command="halt"
		;;
	*6)
		command=reboot
		;;
	*)
		echo "$0: call me as ¥"rc.0¥" or ¥"rc.6¥" please!"
		exit 1
		;;
esac

# Save the system time to the hardware clock using hwclock --systohc.
# Detect SGI Visual Workstation, since hwclock will make those freeze up:
if fgrep -l Cobalt-APIC /proc/interrupts 1> /dev/null 2> /dev/null ; then
  echo "SGI Visual Workstation detected.  Not running hwclock."
elif [ -x /sbin/hwclock ]; then
  if grep "^UTC" /etc/hardwareclock 1> /dev/null 2> /dev/null ; then
    echo "Saving system time to the hardware clock (UTC)."
    /sbin/hwclock --utc --systohc
  else
    echo "Saving system time to the hardware clock (localtime)."
    /sbin/hwclock --localtime --systohc
  fi
fi

# Stop the Samba server:
if [ -x /etc/rc.d/rc.samba ]; then
  . /etc/rc.d/rc.samba stop
fi

# Shut down the NFS server:
if [ -x /etc/rc.d/rc.nfsd ]; then
  /etc/rc.d/rc.nfsd stop
fi

# Unmount any NFS or SMB filesystems:
echo "Unmounting remote filesystems."
umount -a -r -t nfs,smbfs

# Shut down PCMCIA devices:
if [ -x /etc/rc.d/rc.pcmcia ] ; then
  . /etc/rc.d/rc.pcmcia stop
  # The cards might need a little extra time here to initialize.
  sleep 5
fi

# Kill all processes.
# INIT is supposed to handle this entirely now, but this didn't always
# work correctly without this second pass at killing off the processes.
# Since INIT already notified the user that processes were being killed,
# we'll avoid echoing this info this time around.
if [ "$1" != "fast" ]; then # shutdown did not already kill all processes
  killall5 -15 
  sleep 5
  killall5 -9
fi

# Try to turn off quota:
if fgrep quota /etc/fstab 1> /dev/null 2> /dev/null ; then
  if [ -x /sbin/quotaoff ]; then
    echo "Turning off filesystem quotas."
    /sbin/quotaoff -a
  fi
fi

# Before unmounting file systems write a reboot or halt record to wtmp.
$command -w

# Carry a random seed between reboots.
# Save 512 bytes, which is the size of the entropy pool.
echo "Saving random seed from /dev/urandom in /etc/random-seed."
dd if=/dev/urandom of=/etc/random-seed count=1 bs=512 2> /dev/null

# Clear /var/lock/subsys.
if [ -d /var/lock/subsys ]; then
  rm -f /var/lock/subsys/*
fi

# Turn off swap, then unmount local file systems.
echo "Turning off swap."
swapoff -a
echo "Unmounting local file systems."
# Don't remount UMSDOS root volumes:
if [ ! "`mount | head -1 | cut -d ' ' -f 5`" = "umsdos" ]; then
  umount -a -r -t nonfs
  echo "Remounting root filesystem read-only."
  mount -n -o remount,ro /
else
  umount -a -r -t nonfs,noumsdos,nosmbfs
fi

# This never hurts:
sync

# If we're using LVM, we need to deactivate the volume groups:
if [ -r /etc/lvmtab ]; then
  /sbin/vgchange -an
fi

# sleep 1 fixes problems with some hard drives that don't
# otherwise finish syncing before reboot or poweroff
sleep 1

# This is to ensure all processes have completed on SMP machines:
wait

if [ -x /sbin/genpowerd ]; then
  # See if this is a powerfail situation:
  if grep FAIL /etc/upsstatus 1> /dev/null 2> /dev/null ; then
    # Signal UPS to shut off the inverter:
    /sbin/genpowerd -k /dev/ttyS4 tripp-nt
    if [ ! $? = 0 ]; then
      echo
      echo "There was an error signaling the UPS."
      echo "Perhaps you need to edit /etc/rc.d/rc.6 to configure"
      echo "the serial line and UPS type."
      # Wasting 15 seconds of precious power:
      sleep 15
    fi
  fi
fi

# Now halt (poweroff with APM kernels) or reboot.
if [ "$command" = "reboot" ]; then
  echo "Rebooting."
  reboot
else
  poweroff
fi

bash# shutdown -r now