From: Joel VanderWerf <vjoel@...>
Date: 2008-07-27T03:10:18+09:00
Subject: Re: if expression or muffle an exception?

aidy wrote:
>    begin
>       system("taskkill /im firefox.exe /f")
>     rescue
>      #preventing exception if firefox process does not exist
>     end

Kernel#system doesn't raise exceptions. Check the return value and $?.

---------------------------------------------------------- Kernel#system
      system(cmd [, arg, ...])    => true or false
------------------------------------------------------------------------
      Executes _cmd_ in a subshell, returning +true+ if the command was
      found and ran successfully, +false+ otherwise. An error status is
      available in +$?+. The arguments are processed in the same way as
      for +Kernel::exec+.

         system("echo *")
         system("echo", "*")

      _produces:_

         config.h main.rb
         *

-- 
       vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407