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Adds examples for File System related utility functions;
Signed-off-by: Ashwin Hegde <ashwin.hegde3@gmail.com>
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‎Kit/Session-5/FS/FixContent/email1.txt‎

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Hi,
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My name is Ashwin Hegde.

‎Kit/Session-5/FS/FixContent/email2.txt‎

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Hi,
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Welcome to the world of Node.js.

‎Kit/Session-5/FS/FixContent/file-a.txt‎

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‎Kit/Session-5/FS/directory-1.js‎

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/***
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* The goal of this file is to know about the file system functions;
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*
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*
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* How to run this example:
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* 1. node directory-1.js
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* 2. See the message get displayed on prompt.
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*/
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var fs = require('fs'),
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dirName = 'Folder1';
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/***
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* Create a directory.
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*/
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fs.mkdir(dirName, function(error) {
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if (error) throw error;
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console.log('Directory created successfully.');
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});
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/***
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* Removed a directory.
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*/
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fs.rmdir(dirName, function(error) {
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if (error) throw error;
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console.log('Directory removed successfully.');
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});

‎Kit/Session-5/FS/directory-2.js‎

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/***
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* The goal of this file is to know about the file system functions;
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*
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*
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* How to run this example:
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* 1. node directory-2.js
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* 2. See the message get displayed on prompt.
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*/
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var fs = require('fs'),
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dirName = 'FixContent';
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/***
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* Read a directory.
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*/
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fs.readdir(dirName, function(error, files) {
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if (error) throw error;
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console.log('Following are the directory contents: ');
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console.log(files);
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});

‎Kit/Session-5/FS/fileSys-1.js‎

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/***
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* The goal of this file is to know about the file system functions;
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*
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*
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* How to run this example:
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* 1. node fileSys-1.js
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* 2. See the message get displayed on prompt.
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*/
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var fs = require('fs'),
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path = require('path'),
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filename1 = path.normalize('FixContent/email1.txt'),
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filename2 = 'message.txt',
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filename3 = path.normalize('FixContent/file-a.txt'),
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filename4 = path.normalize('FixContent/file-b.txt');
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/***
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* Read a file.
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*/
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fs.readFile(filename1, 'utf-8', function(error, data) {
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if (error) throw error;
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console.log('Following are the file content:');
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console.log(data);
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});
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/***
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* Write content to a file. If file already exists, Node will remove it and write it.
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*/
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fs.writeFile(filename2, 'Hello World', function(error) {
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if (error) throw error;
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console.log('File is written successfully.');
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});
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/***
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* Append content to a file. If file already exists, Node will open it and append the content.
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*/
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fs.appendFile(filename2, '\nWelcome to Node.js training sessions.', function(error) {
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if (error) throw error;
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console.log('Content appended successfully.');
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});
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/***
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* Remove a file.
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*/
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fs.unlink(filename2, function(error) {
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if (error) throw error;
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console.log('%s removed successfully.', filename2);
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});
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/***
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* Rename a file.
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*/
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fs.rename(filename3, filename4, function(error) {
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if (error) throw error;
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console.log('%s renamed successfully.');
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});

‎Kit/Session-5/FS/fileSys-2.js‎

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/***
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* The goal of this file is to know about the file system functions;
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*
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*
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* How to run this example:
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* 1. node fileSys-2.js
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* 2. See the message get displayed on prompt.
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*/
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var fs = require('fs'),
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path = require('path'),
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filename1 = path.normalize('FixContent/email1.txt'),
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filename2 = path.normalize('FixContent/email15.txt');
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/***
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* Check a file already exists.
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*/
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fs.exists(filename1, function(exists) {
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if (exists) {
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console.log('%s already exists.', filename1);
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} else {
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console.log('%s does not exists.', filename1);
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}
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});
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/***
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* Check a file already exists.
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*/
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fs.exists(filename2, function(exists) {
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if (exists) {
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console.log('%s already exists.', filename2);
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} else {
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console.log('%s does not exists.', filename2);
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}
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});

‎Kit/Session-5/FS/fileSys-3.js‎

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/***
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* The goal of this file is to know about the file system functions;
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*
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*
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* How to run this example:
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* 1. node fileSys-3.js
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* 2. See the message get displayed on prompt.
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*/
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var fs = require('fs'),
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path = require('path'),
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filename1 = path.normalize('FixContent/email1.txt'),
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filename2 = 'message.txt';
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/***
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* Open a file.
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*/
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/***
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* Read a file.
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*/
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/***
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* Write a file.
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*/
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/***
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* Close a file.
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*/

‎Kit/Session-5/FS/fileSys-4.js‎

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/***
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* The goal of this file is to know about the file system functions;
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*
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*
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* How to run this example:
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* 1. node fileSys-4.js
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* 2. See the message get displayed on prompt.
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*/
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var fs = require('fs'),
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path = require('path'),
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filename1 = path.normalize('FixContent/email2.txt');
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/***
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* Keep a watch on file with watch.
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*/
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fs.watch(filename1, function(event, filename) {
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console.log('%s event got triggered.', event);
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if (filename) {
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console.log('%s is provided.', filename);
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} else {
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console.log('%s is not provided.', filename);
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}
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});
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/***
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* Keep a watch on file with watchFile.
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*/
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fs.watchFile(filename1, function(curr, prev) {
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console.log('The current modified time is: ' + curr.mtime);
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console.log('The previous modified time was: ' + prev.mtime);
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});
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/***
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* Unwatch a file.
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*/
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fs.unwatchFile(filename1);

‎Kit/Session-5/FS/fileSys-5.js‎

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/***
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* The goal of this file is to know about the file system functions;
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*
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*
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* How to run this example:
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* 1. node fileSys-5.js
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* 2. See the message get displayed on prompt.
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*/
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var fs = require('fs'),
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path = require('path'),
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filename1 = path.normalize('FixContent/email2.txt');
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/***
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* createReadStream a file.
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*/
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var data = fs.createReadStream(filename1, {flags:'r', encoding:'utf-8', start:2, end:8, autoClose:true});
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console.log(data);
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/***
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* createWriteStream a file.
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*/
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