Ruby-on-rails 如何在 Rake 任务中执行命令？
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How to execute commands within Rake tasks?
提问by palani
I have the rake tasks in my rails application. i want to run a commandline commands with in rake task. how can i do this. i tried by the following but fails
我的 rails 应用程序中有 rake 任务。我想在 rake 任务中运行命令行命令。我怎样才能做到这一点。我尝试了以下但失败了
desc "Sending the newsletter to all the users"
task :sending_mail do
run "cd #{RAILS_ROOT} && ar_sendmail -o -t NewsLetters -v"
system "cd #{RAILS_ROOT} && ar_sendmail -o -t NewsLetters -v &"
end
The above run command throws run method undefined & System command not throwing any errors but not executed.
上面的 run 命令抛出 run method undefined & System 命令没有抛出任何错误但没有执行。
采纳答案by krunal shah
This links may help you run command line command into ruby ...
此链接可以帮助您将命令行命令运行到 ruby ...
http://zhangxh.net/programming/ruby/6-ways-to-run-shell-commands-in-ruby/
http://zhangxh.net/programming/ruby/6-ways-to-run-shell-commands-in-ruby/
Calling shell commands from Ruby
http://blog.jayfields.com/2006/06/ruby-kernel-system-exec-and-x.html
http://blog.jayfields.com/2006/06/ruby-kernel-system-exec-and-x.html
%x[command].each do |f|
value = f
end
回答by tadman
runis used by Capistrano and other things for launching commands, but Rake often makes use of Kernel#systeminstead.
runCapistrano 和其他东西使用它来启动命令，但 Rake 经常使用它来Kernel#system代替。
Your command might be being run, but not working. Why not make a wrapper shell script you can test independently, or try and kick off using the full path:
您的命令可能正在运行，但不起作用。为什么不制作一个可以独立测试的包装器 shell 脚本，或者尝试使用完整路径开始：
newsletter_script = File.expand_path('ar_sendmail', RAILS_ROOT)
if (File.exist?(newsletter_script))
unless (system(newsletter_script + ' -o -t NewsLetters -v &'))
STDERR.puts("Script #{newsletter_script} returned error condition")
end
else
STDERR.puts("Could not find newsletter sending script #{newsletter_script}")
end
It would seem odd to have your script not in scripts/
没有你的脚本似乎很奇怪 scripts/
The systemcall should return trueon success. If this is not the case, either the script returned an error code, or the command could't be run.
该system调用应该返回true成功。如果不是这种情况，要么是脚本返回了错误代码，要么是无法运行命令。
