Eek. Or this:

cmd = "export version_postfix='#{version_postfix}' && cd #{project_id}
+/#{src} && rm -rf *.gz && rm -rf MANIFEST && perl Build.PL --quiet 1>
+/dev/null 2>module_build.err.log  && ./Build realclean && perl Build.
+PL --quiet 1>/dev/null 2>module_build.err.log && ./Build manifest --q
+uiet 2>/dev/null 1>/dev/null  && ./Build dist --quiet 1>/dev/null"
[download]

Hopefully you don't have any important zipped files lying around in that directory. And hopefully nothing anywhere near this script involves shell metacharacters, because this guy has never heard of escaping. An amateur implementation of a pointless idea -- all too common in Ruby.