objective c - OS X application that can run shell commands -

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I tried to ask this question, but they sent me back here.

I have created a custom file association with TextEdit and it is working. Now I have to create an application that is custom to my custom Uses the file association and runs shell command to open non-proprietary applications (such as text edit, VLC, act). This app will be downloaded from the web.

How can I get all this? It can be in any language, but better objective-c

It seems like there is a better way to do this 

  [[NSWorkspace sharedWorkspace] openFile: @ "& lt; FULL_PATH_TO_YOUR_ASSOSIATED_FILE & gt;"];  openFile   
 
 for  
 opens the specified file using the default app related to its type.   
 
 The less elegant way to do this is as follows:  
 Check the status of the  open  command on your system such as < Use the foundations for the code> whereis open  and the executable to change the code  
  NSTask * task = [[NSTask alloc] init]; [Work Set Lockpath: @ "& lt; FULL_PATH_TO_OPEN_COMMAND & gt;"]; [Work setAlgatas: @ [@ "& lt; FULL_PATH_TO_YOUR_ASSOSIATED_FILE & gt;"]] ;; [Launch the task];

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