#!/usr/bin/env node

console.log('hello world');

$ chmod 755 ./bin/helper

$ ./bin/helper
hello world

{
 "name": "helper",
 "bin": {
 "helper": "bin/helper"
 }
}

$ npm link

/node_path/bin/helper -> /node_path/lib/node_modules/myModule/bin/helper
/node_path/lib/node_modules/myModule -> /Users/ipluser/myModule

$ helper
hello world

$ npm install --save commander

#!/usr/bin/env node

var program = require('commander');

program
 .version('1.0.0')
 .parse(process.argv);

$ helper -h

 Usage: helper [options]

 Options:

 -h, --help  output usage information
 -V, --version output the version number

$ helper -V
1.0.0

#!/usr/bin/env node

var program = require('commander');

program
 .version('1.0.0')
 .usage('<command> [options]')
 .command('hello', 'hello the author') // 添加hello命令
 .parse(process.argv);

#!/usr/bin/env node

console.log('hello author');

$ helper hello ipluser
hello author

#!/usr/bin/env node

var program = require('commander');

program.parse(process.argv);

const author = program.args[0];

console.log('hello', author);

$ helper hello ipluser
hello ipluser

#!/usr/bin/env node

var program = require('commander');

program.usage('<author>');

// 用户输入`helper hello -h`或`helper hello --helper`时，显示命令使用例子
program.on('--help', function() {
 console.log(' Examples:');
 console.log(' $ helper hello ipluser');
 console.log();
});

program.parse(process.argv);
(program.args.length < 1) && program.help(); // 用户没有输入信息时，调用`help`方法显示帮助信息

const author = program.args[0];

console.log('hello', author);

$ helper hello

 Usage: helper-hello <author>

 Options:

 -h, --help output usage information

 Examples:
 $ helper hello ipluser

$ helper hello -h

 Usage: helper-hello <author>

 Options:

 -h, --help output usage information

 Examples:
 $ helper hello ipluser