add code

src/shell/ls/index.js

@@ -0,0 +1,21 @@
+#! /usr/bin/env node
+
+const fs = require('fs');
+const path = require('path')
+const chalk = require('chalk')
+const log = console.log
+let arr = []
+
+fs.readdir(path.resolve(process.cwd()), { withFileTypes: true }, (err, files) => {
+  if (err) return
+
+  files.forEach((file) => {
+    if (file.isDirectory()) {
+      arr.push(chalk.cyan.bold(file.name))
+    } else {
+      arr.push(chalk.white(file.name))
+    }
+  })
+
+  log(arr.join(' '))
+})

src/shell/md5pic/index.js

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+#! /usr/bin/env node
+const path = require('path')
+const fs =  require('fs')
+const { createHash } = require('crypto')
+
+const argv = process.argv
+const prefix = `http://cdn.fasionchan.com/course`
+const tmp = argv[2]
+const host = argv[3]
+
+function md5 (data) {
+  return createHash('md5').update(data).digest('hex')
+}
+
+if (!tmp || !host) {
+  console.log('请输入两个参数')
+  return
+}
+
+const directory = path.resolve(__dirname, tmp)
+
+try {
+  let txt = ''
+  const files = fs.readdirSync(directory, {
+    withFileTypes: true
+  })
+  files.forEach((file) => {
+    let filePath = path.resolve(directory, file.name)
+    let extname = path.extname(filePath)
+    let con = fs.readFileSync(filePath)
+    let md5num = md5(con)
+    let newFilePath = path.resolve(directory, md5num + extname)
+    fs.renameSync(filePath, newFilePath)
+    console.log(`${file.name} ===============> ${md5num}${extname}`)
+    txt += `![](${prefix}/${host}/${md5num}${extname})\n`
+  })
+
+  fs.writeFileSync('pic.md', txt, 'utf8')
+
+} catch(err) {
+  console.log('失败了')
+  console.log(err)
+}
+

src/shell/nc/nc.js

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+#! /usr/bin/env node
+
+const net = require('net');
+
+const DEFAULT_PORT = 8888;
+let argvs = process.argv
+argvs.shift();
+argvs.shift();
+console.log(argvs);
+
+if (argvs[0] === '-l') {
+  let port = argvs[1] || DEFAULT_PORT;
+  createNetServer(port);
+}
+
+if (argvs[0] === '-h') {
+  let host = argvs[1] || 'localhost';
+  let port = argvs[3] || DEFAULT_PORT;
+  createNetClient(host, port);
+}
+
+// process.stdin.on('readable', () => {
+//   let chunk;
+//   while((chunk === process.stdin.read()) !== null) {
+//     process.stdout.write(`数据：${chunk}`)
+//   }
+// });
+
+function createNetServer (port) {
+  let server = net.createServer((client) => {
+    console.log('client connect');
+
+    client.on('end', () => {
+      console.log('client stop connect');
+    })
+
+    client.write('hello from server\r\n');
+    client.pipe(client);
+  })
+
+  server.on('error', (err) => {
+    throw err;
+  })
+
+  server.listen(port, () => {
+    console.log('server listen port: ', port);
+  })
+}
+
+function createNetClient(host ,port) {
+  let client = net.createConnection({
+    host,
+    port
+  }, () => {
+    console.log('连接服务器');
+    client.write('你好\r\n')
+  })
+
+  client.on('data', (data) => {
+    console.log(data.toString());
+  })
+
+  client.on('end', () => {
+    console.log('已从服务器断开');
+  })
+
+  client.on('error', () => {
+    console.log('fail');
+  })
+}