在ruby中执行shell命令，使用正确的参数转义 [英] Executing shell command in background from ruby with proper argument escaping

问题描述

  system（ rake send_mails subject ='＃{params [：subject]}'2> / dev / null 1> / dev / null&）; 
  

如果我写了 system（rake，send_mails，params [ ：subject]）然后我没有地方的重定向和& 标志。如果我没有为主题参数转义。

我该如何解决？ / p>

解决方案

在Ruby 1.9中，尝试 Process.spawn ：

 ＃产生一个新的过程，运行rake命令
 pid = Process.spawn（{subject=> params [：subject]}，
rake，send_mails，
：out => dev / null'，：err =>'dev / null'）
 
＃分离生成的进程
 Process.detach pid 
  pre> 
I have to run a command in the background but I want to have proper escaping for its parameter.
system("rake send_mails subject='#{params[:subject]}' 2> /dev/null 1> /dev/null &");
If I write system("rake", "send_mails", params[:subject]) then I don't have "place" for redirections and the & sign. If I don't I do not have escaping for the subject parameter.

How can I resolve this?
解决方案
In Ruby 1.9, try Process.spawn:
# Spawn a new process and run the rake command
pid = Process.spawn({"subject" => params[:subject]},
                    "rake", "send_mails",
                    :out => 'dev/null', :err => 'dev/null')

# Detach the spawned process
Process.detach pid


                        
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