gems

gems: 套件包管理工具

# 查詢 gem 可用參數

•  gem -h

# 查詢 gem 命令

• gem help commands

 # 查詢版本

• gem -v

 # 查詢 RubyGems 環境資訊

• gem environment

# 查詢 gem 已經安裝套件

• gem list

 # 安裝套件

• gem install  {套件的名稱}

 # 移除套件

• gem uninstall {套件的名稱}

============== gem help commands 查詢結果 ====================

    build                  Build a gem from a gemspec
    cert                   Manage RubyGems certificates and signing settings
    check                  Check a gem repository for added or missing files
    cleanup                Clean up old versions of installed gems
    contents               Display the contents of the installed gems
    dependency             Show the dependencies of an installed gem
    environment            Display information about the RubyGems environment
    fetch                  Download a gem and place it in the current directory
    generate_index         Generates the index files for a gem server directory
    help                   Provide help on the 'gem' command
    install                Install a gem into the local repository
    list                   Display local gems whose name matches REGEXP
    lock                   Generate a lockdown list of gems
    mirror                 Mirror all gem files (requires rubygems-mirror)
    open                   Open gem sources in editor
    outdated               Display all gems that need updates
    owner                  Manage gem owners of a gem on the push server
    pristine               Restores installed gems to pristine condition from
                           files located in the gem cache
    push                   Push a gem up to the gem server
    query                  Query gem information in local or remote repositories
    rdoc                   Generates RDoc for pre-installed gems
    regenerate_binstubs    Re run generation of executable wrappers for gems.
    search                 Display remote gems whose name matches REGEXP
    server                 Documentation and gem repository HTTP server
    sources                Manage the sources and cache file RubyGems uses to
                           search for gems
    specification          Display gem specification (in yaml)
    stale                  List gems along with access times
    uninstall              Uninstall gems from the local repository
    unpack                 Unpack an installed gem to the current directory
    update                 Update installed gems to the latest version
    which                  Find the location of a library file you can require
    wrappers               Re run generation of environment wrappers for gems.
    yank                   Remove a pushed gem from the index




參考：

• gems
• Ruby on Rails 實戰聖經 - 安裝 Rails 開發環境