Hardware Hotplug

echo "- - -" > /sys/class/scsi_host/host0/scan

echo "scsi scan-new-devices" > /proc/scsi/scsi

#!/bin/bash
for CPU in $(ls /sys/devices/system/cpu/ | egrep "cpu[0-9]+$"); do
  CPU_DIR="/sys/devices/system/cpu/${CPU}"
  STATE_FILE="${CPU_DIR}/online"

  echo -e -n "CPU: \"${CPU_DIR}\"\t\t"

  if [ -f "${STATE_FILE}" ]; then
    STATE=$(cat "${STATE_FILE}" | grep "1")
    if [ "x${STATE}" == "x1" ]; then
      echo "already online"
    else
      echo "1" > "${STATE_FILE}"
      echo "new, onlined"
    fi
  else
    echo "already configured"
  fi
done

#!/bin/bash
for MEMORY in $(ls /sys/devices/system/memory/ | egrep "memory[0-9]+$"); do
  SPARSEMEM_DIR="/sys/devices/system/memory/${MEMORY}"
  STATE_FILE="${SPARSEMEM_DIR}/state"
  STATE=$(cat "${STATE_FILE}" | grep -i online)

  echo -e -n "Memory: \"${SPARSEMEM_DIR}\"\t\t"

  if [ "x${STATE}" == "xonline" ]; then
    echo "already online"
  else
    echo "online" > "${STATE_FILE}"
    echo -e "new, onlined"
  fi
done