doExec.js

var LOG_LEVEL = 7; // 7 debug; 6 info; 5 notice; 4 error;
var ADMIN = "admin@localhost";

var NodeSyslogLoggerSimple = require('node-syslog-logger-simple');
var logger = new NodeSyslogLoggerSimple({'level':LOG_LEVEL});
logger.debug('logger=ok');

var exec = require('child_process').exec;
var EXEC_OPTIONS = { encoding: 'utf8',
  timeout: 5000,
  maxBuffer: 200*1024,
  killSignal: 'SIGTERM',
  cwd: null,
  env: null }

function doExec(cmd,msg,callback) {
	var _msg = msg || ""; 
	logger.debug("cmd="+cmd);
	return exec(cmd, EXEC_OPTIONS, function (error, stdout, stderr) {
		if ( error ) {
			logger.error("cmd=\""+cmd+"\"; code="+error.code+"; stderr=\""+stderr+"\";");
			return callback(null,"% sorry, something went wrong, please contact "+ADMIN); // no seppuku 
		}
		if ( stdout ) {
			logger.debug("stdout="+stdout);
			return callback(null, _msg +"\n"+stdout);
		} else  {
			logger.debug("stdout empty!");
			return callback(null, "%");
		}
	});
}