ramdisk create/delete on Mac OS X.

ramdisk.sh

#!/bin/bash

# From http://tech.serbinn.net/2010/shell-script-to-create-ramdisk-on-mac-os-x/
#

ARGS=2
E_BADARGS=99

if [ $# -ne $ARGS ] # correct number of arguments to the script;
then
  echo " "
  echo "To create a RAMDISK -> Usage: `basename $0` create SIZE_IN_MB"
  echo "To delete a RAMDISK -> Usage: `basename $0` delete DISK_ID"
  echo " "
  echo "Currently this script only supports one RAMDISK. Will update soon."
  echo "DISK_ID can be shown with 'mount'. usually /dev/disk* where * is a number"
  echo " "
  echo " "
  exit $E_BADARGS
fi

if [ "$1" = "create" ]
then
  echo "Create ramdisk..."
  RAMDISK_SIZE_MB=$2
  RAMDISK_SECTORS=$((2048 * $RAMDISK_SIZE_MB))
  DISK_ID=$(hdiutil attach -nomount ram://$RAMDISK_SECTORS)
  echo "Disk ID is :" $DISK_ID
  diskutil erasevolume HFS+ "ramdisk" ${DISK_ID}
fi

if [ "$1" = "delete" ]
then
  echo "Delete/unmount ramdisk $2"
  umount -f $2
  hdiutil detach $2
fi