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Bash - 启动和终止进程(Bash - starting and killing processes)

 我需要一些关于“简单”bash脚本的建议。  
 我想开始大约500个程序“myprog”的实例，并在x秒后杀死所有这些实例  
 简而言之，我有一个循环在后台启动程序， sleep x后sleep x （秒数） pkill用程序名称调用。  
 我的问题是：  
 
  如何验证10秒后所有500个实例都在运行？ ps和grep与计数组合还是有另一种方式？  
  如何计算pkill（或类似的kill函数）实际杀死的进程数（以便在实际时间限制之前没有任何进程终止）？  
  如何重定向pkill（或类似的kill函数）的输出，使其不输出被杀死的进程信息，从而./initializeTest: line 250: 7566 Terminated ./$myprog 500行./initializeTest: line 250: 7566 Terminated ./$myprog 。 重定向到/ dev / null并没有成功。  

I need some advice on a "simple" bash script. 
I want to start around 500 instances of a program "myprog", and kill all of them after x number of seconds 
In short, I have a loop that starts the program in background, and after sleep x (number of seconds) pkill is called with the program name. 
My questions are: 
 
 How can I verify that after 10 seconds all 500 instances are running? ps and grep combination with counting or is there another way? 
 How can I get a count of how many processes did the pkill (or similar kill functions) actually kill (so that there are not any processes that terminate before the actual timelimit)? 
 How can one redirect the output of pkill(or similar kill functions) so that it doesn't output the killed process information, so that 500 lines of ./initializeTest: line 250: 7566 Terminated ./$myprog can be avoided. Redirecting to /dev/null didn't do the trick. 

原文：https://stackoverflow.com/questions/5066651

更新时间：2022-10-11 11:10

最满意答案

 最后，在如何使用select2版本4恢复值的一些试验和错误后，它可能不是干净的，但它的工作原理  
<% if f.object.persisted? && f.object.hotel_id  %>
  <% if f.object.hotel_id > 0 %>
    <% value = f.object.hotel_id  %>
    <% text  = Hotel.find(value).name %>
  <% end %>
<% end %>
<%= f.select(:hotel_id, options_for_select([["#{text}", value.to_s]]),  {selected: value},  :class => 'select2-autocomplete' ) %>
 
 关键的答案是底线，  
 
  使用f.select，  
  使用option_for_select生成选项  
  确保选项使用字符串value.to_s  
  根据选项使用{selected：value}  
 
 希望它可以帮助其他使用select2和ajax搜索的rails用户 

Finally after some trial and error below how to use select2 version 4 to restore the value, it's probably not clean but it works 
<% if f.object.persisted? && f.object.hotel_id  %>
  <% if f.object.hotel_id > 0 %>
    <% value = f.object.hotel_id  %>
    <% text  = Hotel.find(value).name %>
  <% end %>
<% end %>
<%= f.select(:hotel_id, options_for_select([["#{text}", value.to_s]]),  {selected: value},  :class => 'select2-autocomplete' ) %>
 
The key answer is bottom line,  
 
 using f.select,  
 generate option using option_for_select  
 make sure the option is using string value.to_s 
 under option use { selected: value} 
 
hope it can help other rails users that using select2 with ajax search

Bash - 启动和终止进程(Bash - starting and killing processes)

最满意答案

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