gistfile1.txt

> irb
irb(main):001:0> require 'open3'
=> true
irb(main):002:0> p = ENV['PATH'];ENV['PATH']=''
=> ""
irb(main):003:0> Open3.popen3('date') {|i,o,e| o.gets}
Errno::ENOENT: No such file or directory - date
	from /usr/lib/ruby/1.9.1/open3.rb:202:in `spawn'
	from /usr/lib/ruby/1.9.1/open3.rb:202:in `popen_run'
	from /usr/lib/ruby/1.9.1/open3.rb:90:in `popen3'
	from (irb):3
	from /usr/bin/irb:12:in `<main>'