How can I get top command output in real time in Mac Os

Question

How can I get top command output in real time in Mac Os

I want to monitor server and show top command output in real time on webpage. there is an error error: initializing curses after program started on Mac OS. I don't know how to deal with it, my question is how to get top command output in real time via Node.JS?

var spawn = require('child_process').spawn,
    com = spawn('/usr/bin/top', []); 
var io = require('socket.io').listen(5555);
  com.stdout.on('data', function(data){
    io.sockets.emit('get result', data);
  }
  );
com.stderr.on('data', function(data){
console.log('stderr: ' + data);
});

node.js
child-process

Answer 1

If you run top in a command window, it updates the data on the screen, using the curses library. Try using the batch-mode '-b' option on top to see if that'll allow node to pipe its output into your

Answer 2

Looks like OSX's top command has to be called with -l flag (other UNIXes use -b). With that flag "curses" library is no longer required (this lib does fancy formatting for default interactive mode) so piping begins to work.

Here is the code to start with:

var top = spawn("top", ["-l 0"]);
top.stdout.pipe(process.stdout);
top.stderr.on("data", function(data) {
  console.log("ps stderr: " + data);
});