ruby gem常用命令

ruby -v                                                                         #查看ruby 版本

ruby -e ''require"watir"; puts Watir::IE::VERSION''　  #查看watir版本
gem -v                                                                         #gem版本
gem update                                                                 #更新所有包
gem update --system                                                  #更新RubyGems软件
gem install rake                                                           #安装rake,从本地或远程服务器
gem install rake --remote                                            #安装rake,从远程服务器
gem install watir -v(或者--version) 1.6.2                     #指定安装版本的
gem uninstall rake                                                      #卸载rake包
gem list d                                                                    #列出本地以d打头的包
gem query -n ''[0-9]'' --local                                         #查找本地含有数字的包
gem search log --both                                                #从本地和远程服务器上查找含有log字符串的包
gem search log --remoter                                          #只从远程服务器上查找含有log字符串的包
gem search -r log                                                      #只从远程服务器上查找含有log字符串的包
gem help                                                                    #提醒式的帮助
gem help install                                                         #列出install命令 帮助
gem help examples                                                   #列出gem命令使用一些例子
gem build rake.gemspec                                          #把rake.gemspec编译成rake.gem
gem check -v pkg/rake-0.4.0.gem                           #检测rake是否有效
gem cleanup                                                            #清除所有包旧版本，保留最新版本
gem contents rake                                                   #显示rake包中所包含的文件
gem dependency rails -v 0.10.1                              #列出与rails相互依赖的包
gem environment                                                     #查看gem的环境