I need a fresh temporary directory to do some work in a shell script. When the work is done (or if I kill the job midway), I want the script to change back to the old working directory and wipe out the temporary one. In Ruby, it might look like this:

require 'tmpdir'

Dir.mktmpdir 'my_build' do |temp_dir|
  puts "Temporary workspace is #{temp_dir}"
  do_some_stuff(temp_dir)
end

puts "Temporary directory already deleted"

What would be the best bang for the buck to do that in a Bash script? I want to trap