The system function attempts to bring the C system() function to node.js with extended functionality. system() executes a command and fires an event when done that will return the command output. system has 2 events: 'data' - returns the output data of the command 'exit' - returns command exit code dependancies npm install colors Examples of the…

system.js

/* License MIT */

var spawn = require( 'child_process' ).spawn,
     colors = require( 'colors' );

/* 
  Executes a command and fires event when done that 
  will return the command output
*/
function system( cmd ){

	var ev = new events.EventEmitter(); 

	if ( !cmd ) return;

	var cmd_string = '';
		parameters = [];

	var command; 

	function add_events(){

		command.stdout.on( 'data', function( data ){

			ev.emit( 'data', data ); /* send the command output */
		} );

		command.stderr.on( 'data', function( data ){

			console.log( 'error: '.red + data );
		} );

		command.on( 'exit', function( code ){

			ev.emit( 'exit', code ); /* send the command exit code */
		} );
	}


	/* seperate the command into command string and parameters */
	var accum = "";
	for ( var i = 0; i < cmd.length; i++ ){

		

		if( cmd[i] === ' ' || i === cmd.length-1 ){

			if( i === cmd.length-1 ) accum += cmd[i];

			if( cmd_string === '' ){ /* this is the command */
				cmd_string = accum;
				accum = '';
			}
			else{
				parameters.push( accum );
				accum = '';
			}


			if( i === cmd.length-1 ){
				if( cmd[i] != ' ' ) accum += cmd[i];
				try{
					command = spawn( cmd_string, parameters );
					add_events();
				}catch ( e ){

					console.log( 'error: '.red + e );
				}
			}
		}

		if( cmd[i] != ' ' ) accum += cmd[i];
		

	}

	return ev;
}	

system.md

var s = system( "uname" );

s.on( 'exit', function( code ){
  console.log( 'uname returned code: ' + code );
} );

s.on( 'data', function( data ){
	console.log( 'data: ' + data );
} );

You should check out procstreams :) https://github.com/polotek/procstreams