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BUNDLE-EXEC(1)									   BUNDLE-EXEC(1)

       bundle-exec - Execute a command in the context of the bundle

       bundle exec command

       This  command  executes the command, making all gems specified in the Gemfile(5) available
       to require in Ruby programs.

       Essentially, if you would normally have run something like rspec spec/my_spec.rb, and  you
       want  to use the gems specified in the Gemfile(5) and installed via bundle install(1) bun-
       dle-install.1.html, you should run bundle exec rspec spec/my_spec.rb.

       Note that bundle exec does not require that an executable is  available	on  your  shell's

       If  you	use  the --binstubs flag in bundle install(1) bundle-install.1.html, Bundler will
       automatically create a directory (which defaults to app_root/bin) containing  all  of  the
       executables available from gems in the bundle.

       After  using  --binstubs,  bin/rspec  spec/my_spec.rb  is  identical  to bundle exec rspec

       bundle exec makes a number of changes to the shell environment, then executes the  command
       you specify in full.

       o   make  sure  that  it's  still  possible  to	shell out to bundle from inside a command
	   invoked by bundle exec (using $BUNDLE_BIN_PATH)

       o   put the directory containing executables (like rails, rspec, rackup) for  your  bundle
	   on $PATH

       o   make  sure  that  if  bundler is invoked in the subshell, it uses the same Gemfile (by
	   setting BUNDLE_GEMFILE)

       o   add -rbundler/setup to $RUBYOPT, which makes sure that Ruby programs  invoked  in  the
	   subshell can see the gems in the bundle

       It also modifies Rubygems:

       o   disallow loading additional gems not in the bundle

       o   modify  the gem method to be a no-op if a gem matching the requirements is in the bun-
	   dle, and to raise a Gem::LoadError if it's not

       o   Define Gem.refresh to be a no-op, since the source index is always frozen  when  using
	   bundler, and to prevent gems from the system leaking into the environment

       o   Override Gem.bin_path to use the gems in the bundle, making system executables work

       o   Add all gems in the bundle into Gem.loaded_specs

   Shelling out
       When shelling out (using the system or backticks methods, for example), Bundler's environ-
       ment changes will propagate to the subshell environment. If you desire to shell out  with-
       out  Bundler's  environment  changes,  simply  employ  the  with_clean_env method. It will
       restore all environment variables to what they were  before  Bundler  was  activated.  For

	   Bundler.with_clean_env do
	     `brew install wget`

       At  present, the Rubygems plugin system requires all files named rubygems_plugin.rb on the
       load path of any installed gem when any Ruby code requires rubygems.rb. This includes exe-
       cutables installed into the system, like rails, rackup, and rspec.

       Since  Rubygems	plugins  can contain arbitrary Ruby code, they commonly end up activating
       themselves or their dependencies.

       For instance, the gemcutter 0.5 gem depended on json_pure. If you had that version of gem-
       cutter  installed  (even  if  you also had a newer version without this problem), Rubygems
       would activate gemcutter 0.5 and json_pure <latest>.

       If your Gemfile(5) also contained json_pure (or a gem with a dependency on json_pure), the
       latest  version	on your system might conflict with the version in your Gemfile(5), or the
       snapshot version in your Gemfile.lock.

       If this happens, bundler will say:

	   You have already activated json_pure 1.4.6 but your Gemfile
	   requires json_pure 1.4.3. Consider using bundle exec.

       In this situation, you almost certainly want to remove the underlying gem with  the  prob-
       lematic	gem plugin. In general, the authors of these plugins (in this case, the gemcutter
       gem) have released newer versions that are more careful in their plugins.

       You can find a list of all the gems containing gem plugins by running

	   ruby -rubygems -e "puts Gem.find_files('rubygems_plugin.rb')"

       At the very least, you should remove all but the newest version of each	gem  plugin,  and
       also remove all gem plugins that you aren't using (gem uninstall gem_name).

					    March 2013				   BUNDLE-EXEC(1)
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