mount ramdisk on Mac OSX

mount_ramdisk

#!/usr/bin/env ruby
mount = '/Volumes/ramdisk'
newfs = '/dev/disk1'

if !ARGV.empty? and ARGV.first =~ /^-+u$/i
  system "umount #{mount} && hdiutil detach #{newfs}"
else
  if File.exists? newfs
    STDERR.puts "already mounted - #{mount}"
    STDERR.puts  "use \"#{$0.split('/').last} -u\""
    exit 1
  end
  size = 200000
  size = ARGV.first.to_i if !ARGV.empty? and ARGV.first =~ /^\d+$/
  puts "mount RAM #{size*512} bytes"
  Dir.mkdir mount unless File.exists? mount
  system "hdid -nomount ram://#{size} && newfs_hfs #{newfs} && mount -t hfs #{newfs} #{mount}"
end