add commander example, copy and remove file

cli/commander/copyAndDelete/README.md

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+# copyAndDelete
+
+This is a CLI built with [commander](https://www.npmjs.com/package/commander). You can copy files to a specific directory path and delete the specified path and its sub-files/folders.
+
+## Usage
+
+Here is the output of running `node bin/cli.js -h` from the `copyAndDelete` directory:
+
+```bash
+Usage: cli.js [file] [path]
+
+Options:
+  --help, -h       Show help                                           [boolean]
+  --version, v     Show version number                                 [boolean]
+```
+
+### As a Local Project
+
+You'll want to start by installing dependencies:
+
+```bash
+npm install
+```
+
+Since this is a CLI, you'll probably want to get it available on your PATH. There's two ways you can do this:
+
+**Via global installation:**
+
+```bash
+npm i -g . # this will install the current working directory as a global module. you will want to do npm uninstall -g . to uninstall it.
+copyAndDelete copy [file] [path] # run the CLI
+copyAndDelete rimraf [path] # run the CLI
+```
+
+**Via symlink:**
+
+```bash
+npm link # this will create a symlink that makes the module act as a global module. npm unlink to remove this.
+copyAndDelete copy [file] [path] # run the CLI
+copyAndDelete rimraf [file] # run the CLI
+```

cli/commander/copyAndDelete/bin/cli.js

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+#!/usr/bin/env node
+const { program } = require('commander')
+
+const copyFile = require('../lib/copyFile')
+const rimraf = require('../lib/rimraf')
+
+program.version('0.0.1', '-v, --version').usage('[options]')
+
+program
+  .command('copy <name> <directory>')
+  .usage('<name> <directory>')
+  .description('Copy file.')
+  .action((name, direcotry) => {
+    copyFile(name, direcotry)
+  })
+
+program
+  .command('rimraf <path>')
+  .usage('<path>')
+  .description('Deletes the specified path and its sub-files/folders.')
+  .action((path) => {
+    rimraf(path)
+  })
+
+program.command('*', { noHelp: true }).action(() => {
+  console.log('Command not found')
+  program.help()
+})
+
+program.parse(process.argv)

cli/commander/copyAndDelete/lib/copyFile.js

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+const path = require('path')
+const fs = require('fs')
+const { exist } = require('./util')
+
+const mkdirp = (dir) => {
+  const dirname = path
+    .relative('.', path.normalize(dir))
+    .split(path.sep)
+    .filter((p) => !!p)
+  dirname.forEach((d, idx) => {
+    const pathBuilder = dirname.slice(0, idx + 1).join(path.sep)
+    if (!exist(pathBuilder)) {
+      fs.mkdirSync(pathBuilder) // make directory
+    }
+  })
+}
+
+const copyFile = (name, directory) => {
+  if (exist(name)) {
+    mkdirp(directory)
+    fs.copyFileSync(name, path.join(directory, name))
+    console.log(`${name} file is copied.`)
+  } else {
+    console.error('File does not exist.')
+  }
+}
+
+module.exports = copyFile

cli/commander/copyAndDelete/lib/rimraf.js

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+const fs = require('fs')
+const path = require('path')
+const { exist } = require('./util')
+
+const rimraf = (p) => {
+  if (exist(p)) {
+    try {
+      const dir = fs.readdirSync(p)
+      console.log(dir)
+      dir.forEach((d) => {
+        rimraf(path.join(p, d))
+      })
+      fs.rmdirSync(p)
+      console.log(`Remove ${p} folder success`)
+    } catch (e) {
+      fs.unlinkSync(p)
+      console.log(`Remove ${p} file success`)
+    }
+  } else {
+    console.error('No such file or directory')
+  }
+}
+
+module.exports = rimraf

cli/commander/copyAndDelete/lib/util.js

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+const fs = require('fs')
+
+const exist = (dir) => {
+  try {
+    fs.accessSync(
+      dir,
+      fs.constants.F_OK | fs.constants.R_OK | fs.constants.W_OK
+    ) // tests a user's permissions for the file or directory specified by path
+    return true // if dir exists, return true.
+  } catch (e) {
+    return false // if dir not exists, return false.
+  }
+}
+
+module.exports = {
+  exist
+}

cli/commander/copyAndDelete/package.json

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+{
+  "name": "copy-and-delete",
+  "version": "1.0.0",
+  "description": "You can copy files to a specific directory path or delete specific files and directory.",
+  "main": "index.js",
+  "scripts": {
+    "lint": "standard",
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "commander": "^6.1.0"
+  },
+  "bin": {
+    "copyAndDelete": "./bin/cli.js"
+  },
+  "devDependencies": {
+    "standard": "^14.3.4"
+  }
+}