Volume unmount utility for Mac OS X.

ejector.rb

#!/usr/bin/env ruby

class Runner
  attr_reader :args
  def initialize(args)
    @args = args
  end

  def run
    targets = targets_by_args %w(/Volumes/Name1 /Volumes/Name2 /Volumes/Name3)
    disks = pick_disks targets
    umount_disks disks
  end

  private
  def pick_disks(*names)
    names = [names].flatten
    lines = `df`.chomp.split(/\r?\n/)
    disks = []
    names.each do |name|
      lines.each do |line|
        if line.index name
          disks << line.split(/\s+/)[0]
        end
      end
    end
    disks
  end
  def targets_by_args(*names)
    names = [names].flatten
    return names if @args.size == 0
    targets = []
    @args.each do |arg|
      da = arg.downcase
      names.each do |name|
        if name.downcase.index(da)
          targets << name
        end
      end
    end
    targets
  end
  def umount_disks(disks)
    disks.each do |disk|
      cmd = "diskutil umount #{disk}"
      puts cmd
      `#{cmd}`
    end
  end
end

Runner.new(ARGV).run