Node.js process All In One

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Node.js process All In One

process.argv

Passing in arguments via the command line is an extremely basic programming task and a necessity for anyone trying to write a simple Command-Line Interface (CLI).
In Node.js, as in C and many related environments, all command-line arguments received by the shell are given to the process in an array called argv (short for 'argument values').

通过命令行传递参数是一项非常基本的编程任务，对于任何尝试编写简单命令行界面 (CLI) 的人来说都是必需的。
在 Node.js 中，与在 C 和许多相关环境中一样，shell 接收到的所有命令行参数都以名为 argv（“参数值”的缩写）的数组的形式提供给进程。

$ node ./process-argv.js arg1 arg2

// process-argv.js
"use strict";

/**
 *
 * @author xgqfrms
 * @license MIT
 * @copyright xgqfrms
 * @created 2022-03-12
 * @modified
 *
 * @description process-argv.js
 * @difficulty Easy
 * @complexity O(n)
 * @time O(n)
 * @augments
 * @example
 * @link
 * @solutions
 *
 * @best_solutions
 *
 */

const log = console.log;


// log('process', process);
log('process.argv =', process.argv);
/*
process.argv [
  '/Users/xgqfrms-mbp/.nvm/versions/node/v12.18.0/bin/node',
  '/Users/xgqfrms-mbp/Documents/GitHub/node.js-learning/src/process-args.js',
  'arg1',
  'arg2'
]
*/
log('process.argv[2[] =', process.argv[2]);
// arg1

const args = process.argv.slice(2);

log('args =', args);
// args = [ 'arg1', 'arg2' ]

for (const [i, arg] of args.entries()) {
  log(`args$[i] =`, arg);
}

process.env

# npm cli args
$ yarn dev  --port=8090 --env=prod

# cross-env
$ yarn dev  cross-env NODE_ENV=development

refs

https://nodejs.org/en/knowledge/command-line/how-to-parse-command-line-arguments/

https://gist.github.com/xgqfrms/e60ff1bfe458da85c7620b871205e090

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