在比如搭長程客運時、沒有網路連線的狀態下還蠻實用的（不過搭客運也要考慮硬碟震動的損害問題就是了…）：
- rake rails:freeze:gems
- rake doc:rails
- rake doc:guides
參考文獻：
- Getting Started With Rails
- Ruby Newbie » Blog Archive » Get local copies of the Ruby, gems, and MacPorts RDocs and the Rails API
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