..$ rails s
=> Booting WEBrick
=> Rails 4.0.4 application starting in development on https://0.0.0.0:3000
=> Run `rails server -h` for more startup options
=> Ctrl-C to shutdown server
A server is already running. Check /home/..name/rprojects/railsapp/tmp/pids/server.pid.
Exiting
..$ rails s
=> Booting WEBrick
=> Rails 4.0.4 a
阅读背景：
服务器已经在运行了。检查……/ tmp / pid / server.pid。退出——rails
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