Ruby曾经有一个Ping.pingecho方法，但似乎(和Ping模块)在某个时候消失了:%rvmuse1.8.7Using~/.rvm/gems/ruby-1.8.7-p334%ruby-rping-e'pPing.pingecho"127.0.0.1"'true%rvmuse1.9.2Using~/.rvm/gems/ruby-1.9.2-p180%ruby-rping-e'pPing.pingecho"127.0.0.1"':29:in`require':nosuchfiletoload--ping(LoadError)from:29:in`require'%ruby-e'pP