Node.js IO

node_io.js

// Require the filesystem module from Node.js
var fs = require("fs");

// Create a new date at this exact moment
var date = new Date();

// Retrieve the date, month, hour, minute and second
var dateDate = date.getDate(),
    dateMonth = date.getMonth() + 1, // Since the getMonth method is 0-based we need to add one to make it 1-12
    dateHour = date.getHours(),
    dateMinute = date.getMinutes(),
    dateSecond = date.getSeconds();

// Prepare the custom message to write to the file
var msg = "-----------------------------------------" + "\n" + process.argv[2] + "\n" + dateDate + "/" + dateMonth + " " + dateHour + ":" + dateMinute + ":" + dateSecond + "\n";

// Declare an if statement to check if the arg 'view' is passed with the command
if (process.argv[2] == 'view') {
    
    // If it is dump the entire content to the console
    fs.readFile('log.log', 'utf-8', function (err, data) {
        
        // Throw the error if there is oen
        if (err) throw err;
        
        // If not log the content to the console
        console.log(data);
    });

// Else if the argument delete is passed with the command delete the entire file
} else if (process.argv[2] == 'delete') {
    
    // Write an empty string to the file, this is the same as deleting the whole thing
    fs.writeFile("log.log", "", function(err) {
        
        // Throw the error if there is one
        if (err) throw err;
    });

// If none of the above statements match, append the msg to the log file
} else {
    
    // Append the msg to the log.log file
    fs.appendFile("log.log", msg, function(err){
        
        // Throw the error if you encounter one
        if (err) throw err;
    });
}