Opening .sh file through ajax request

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Ajax

shell

I am trying to send a ajax request to a shell file on my server. But i dont seem to get access to that shell file. i.e. the shell file is not getting executed through Aajax request but gets executed through terminal.
Here is a code :

var Settings;
    if(!Settings && typeof XMLHttpRequest != "undefined")
    {
      Settings = new XMLHttpRequest();

    }
    Settings.open("POST","Check.sh",true);
    Settings.send();

I am using a uhttp server for my device.