const os = require('os');
// 本机 mac 环境
// 不同系统的行末尾标志
console.log(`${JSON.stringify(os.EOL)}`); // "\n", windows 下 "\r\n"
// 操作系统 cpu 架构, 现在可能的值有: 'arm', 'arm64', 'ia32', 'mips', 'mipsel', 'ppc', 'ppc64', 's390', 's390x', 'x32', 'x64'。
console.log(`${os.arch()} ${process.arch}`); // x64 x64,
// 常见的错误码定义
// console.log(JSON.stringify(os.constants));
// {"UV_UDP_REUSEADDR":4,"errno":{"E2BIG":7,"EACCES":13,"EADDRINUSE":48,"EADDRNOTAVAIL":49,"EAFNOSUPPORT":47,"EAGAIN":35,"EALREADY":37,"EBADF":9,"EBADMSG":94,"EBUSY":16,"ECANCELED":89,"ECHILD":10,"ECONNABORTED":53,"ECONNREFUSED":61,"ECONNRESET":54,"EDEADLK":11,"EDESTADDRREQ":39,"EDOM":33,"EDQUOT":69,"EEXIST":17,"EFAULT":14,"EFBIG":27,"EHOSTUNREACH":65,"EIDRM":90,"EILSEQ":92,"EINPROGRESS":36,"EINTR":4,"EINVAL":22,"EIO":5,"EISCONN":56,"EISDIR":21,"ELOOP":62,"EMFILE":24,"EMLINK":31,"EMSGSIZE":40,"EMULTIHOP":95,"ENAMETOOLONG":63,"ENETDOWN":50,"ENETRESET":52,"ENETUNREACH":51,"ENFILE":23,"ENOBUFS":55,"ENODATA":96,"ENODEV":19,"ENOENT":2,"ENOEXEC":8,"ENOLCK":77,"ENOLINK":97,"ENOMEM":12,"ENOMSG":91,"ENOPROTOOPT":42,"ENOSPC":28,"ENOSR":98,"ENOSTR":99,"ENOSYS":78,"ENOTCONN":57,"ENOTDIR":20,"ENOTEMPTY":66,"ENOTSOCK":38,"ENOTSUP":45,"ENOTTY":25,"ENXIO":6,"EOPNOTSUPP":102,"EOVERFLOW":84,"EPERM":1,"EPIPE":32,"EPROTO":100,"EPROTONOSUPPORT":43,"EPROTOTYPE":41,"ERANGE":34,"EROFS":30,"ESPIPE":29,"ESRCH":3,"ESTALE":70,"ETIME":101,"ETIMEDOUT":60,"ETXTBSY":26,"EWOULDBLOCK":35,"EXDEV":18},"signals":{"SIGHUP":1,"SIGINT":2,"SIGQUIT":3,"SIGILL":4,"SIGTRAP":5,"SIGABRT":6,"SIGIOT":6,"SIGBUS":10,"SIGFPE":8,"SIGKILL":9,"SIGUSR1":30,"SIGSEGV":11,"SIGUSR2":31,"SIGPIPE":13,"SIGALRM":14,"SIGTERM":15,"SIGCHLD":20,"SIGCONT":19,"SIGSTOP":17,"SIGTSTP":18,"SIGTTIN":21,"SIGTTOU":22,"SIGURG":16,"SIGXCPU":24,"SIGXFSZ":25,"SIGVTALRM":26,"SIGPROF":27,"SIGWINCH":28,"SIGIO":23,"SIGINFO":29,"SIGSYS":12}}
// cpu 相关信息
// console.log(os.cpus());
// [{ model: 'Intel(R) Core(TM) i7-8850H CPU @ 2.60GHz', // cpu 型号
// speed: 2600, // cpu 频率, 单位: 兆赫兹
// times: {
// user: 8320780, // CPU花费在用户模式下的毫秒时间数.
// nice: 0, // CPU花费在良好模式下的毫秒时间数.
// sys: 9282500, // CPU花费在系统模式下的毫秒时间数.
// idle: 73312630, // CPU花费在空闲模式下的毫秒时间数.
// irq: 0 // CPU花费在中断请求模式下的毫秒时间数.
// }
// }]
// nodejs 二进制编译环境的字节顺序.
console.log(os.endianness()); // LE, BE 大端模式, LE 小端模式
// 空闲内存
console.log(os.freemem()); // 1657503744, 单位: 字节
// 获取指定进程的优先级
console.log(os.getPriority(process.pid)); // 0
// 获取当前用户的 home 目录
console.log(os.homedir()); // /Users/wangjun
// 作系统的主机名.
console.log(os.hostname()); // wangjundeMacBook-Pro.local
// 系统平均负载, 包含1, 5, 15分钟平均负载, window 无效
console.log(os.loadavg()); // [ 2.1630859375, 2.458984375, 2.8115234375 ]
// 获取系统网络相关信息
// console.log(os.networkInterfaces());
// { lo0:
// [ { address: '127.0.0.1', // ipv4/ipv6 地址
// netmask: '255.0.0.0', // 子网掩码
// family: 'IPv4', // ipv4/ipv6
// mac: '00:00:00:00:00:00', // mac 地址
// internal: true, // 是否为内部接口
// cidr: '127.0.0.1/8' }, // 带路由前缀的 ipv4/ipv6 地址
// { address: '::1',
// netmask: 'ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff',
// family: 'IPv6',
// mac: '00:00:00:00:00:00',
// scopeid: 0,
// internal: true,
// cidr: '::1/128' },
// { address: 'fe80::1',
// netmask: 'ffff:ffff:ffff:ffff::',
// family: 'IPv6',
// mac: '00:00:00:00:00:00',
// scopeid: 1, // IPv6 数字领域识别码 (只有当 family 是IPv6时可用)
// internal: true,
// cidr: 'fe80::1/64' },
// { address: '127.94.0.1',
// netmask: '255.0.0.0',
// family: 'IPv4',
// mac: '00:00:00:00:00:00',
// internal: true,
// cidr: '127.94.0.1/8' } ],
// en0:
// [ { address: 'fe80::ce:5077:9570:3dc5',
// netmask: 'ffff:ffff:ffff:ffff::',
// family: 'IPv6',
// mac: 'f0:18:98:13:0e:1b',
// scopeid: 10,
// internal: false,
// cidr: 'fe80::ce:5077:9570:3dc5/64' },
// { address: '192.168.31.52',
// netmask: '255.255.255.0',
// family: 'IPv4',
// mac: 'f0:18:98:13:0e:1b',
// internal: false,
// cidr: '192.168.31.52/24' } ] }
// Node.js编译时的操作系统平台
console.log(`${os.platform()} ${process.platform}`); // darwin, 可能值有: aix, darwin, freebsd, linux, openbsd, sunos, win32
// 获取 操作系统的发行版.
console.log(os.release()); // 18.6.0
// 设置某进程优先级, -20(高) - 19(低)
// os.setPriority(process.pid, -1); // 若运行权限不够会报错, SystemError [ERR_SYSTEM_ERROR]: A system error occurred: uv_os_setpriority returned EACCES (permission denied)
// console.log(os.getPriority(process.pid));
// 临时目录
console.log(os.tmpdir()); // /var/folders/87/yfjc65dj7r132llyzkfg733c0000gn/T
// 总内存
console.log(os.totalmem()); // 17179869184
// 操作系统类型
console.log(os.type()); // Darwin, 可能值有, Linux, Darwin, Windows_NT
// 获取用户信息
const userInfo = os.userInfo({
encoding: "utf8"
});
console.log(userInfo);
// { uid: 501,
// gid: 20,
// username: 'wangjun',
// homedir: '/Users/wangjun',
// shell: '/bin/zsh' }const path = require('path');
// path.basename() 返回 path 的最后一部分
console.log(path.basename(`C:\\temp\\file.html`)); // C:\temp\file.html
console.log(path.win32.basename(`C:\\temp\\file.html`)); // file.html
console.log(path.basename(`/Users/wangjun/Desktop/file.html`)); // file.html
console.log(path.posix.basename(`/Users/wangjun/Desktop/file.html`)); // file.html
console.log(path.basename(`/Users/wangjun/Desktop/file.html`, '.html')); // file
console.log(path.basename(`/Users/wangjun/Desktop/file.html`, '.png')); // file.html
// 路径定界符, : ;
console.log(path.delimiter); // :
console.log(process.env.PATH); // /usr/local/opt/apr/bin:/usr/local/opt/apr-util/bin:/usr/local/opt/ruby/bin:/Users/wangjun/.nvm/versions/node/v8.9.1/bin:/Users/wangjun/.cargo/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/opt/X11/bin:/Users/wangjun/Library/Android/sdk/ndk-bundle/:/Users/wangjun/.fzf/bin:/Users/wangjun/Desktop/source/flutter/bin
console.log(process.env.PATH.split(path.delimiter)); // ["/usr/local/opt/apr/bin","/usr/local/opt/apr-util/bin","/usr/local/opt/ruby/bin","/Users/wangjun/.nvm/versions/node/v8.9.1/bin","/Users/wangjun/.cargo/bin","/usr/local/bin","/usr/bin","/bin","/usr/sbin","/sbin","/opt/X11/bin","/Users/wangjun/Library/Android/sdk/ndk-bundle/","/Users/wangjun/.fzf/bin","/Users/wangjun/Desktop/source/flutter/bin"]
// 返回路径的目录
console.log(path.dirname('/Users/wangjun/Desktop/file.html')); // /Users/wangjun/Desktop
// 返回路径扩展名
console.log(path.extname('file.html')); // .html
console.log(path.extname('file.html.gz')); // .gz
console.log(path.extname('file.')); // .
console.log(path.extname('file')); // 空字符串
console.log(path.extname('.file')); // 空字符串
// 格式化一个路径, 注意: 如果提供了 pathObject.dir，则忽略 pathObject.root。如果 pathObject.base 存在，则忽略 pathObject.ext 和 pathObject.name。
console.log(path.format({
// root: '/',
dir: '/Users/wangjun',
base: 'file.html',
// name: 'file',
// ext: '.html'
})); // /Users/wangjun/file.html
// 判断是否为绝对路径
console.log(path.isAbsolute(`/Users/wangjun/Desktop/file.html`)); // true
console.log(path.isAbsolute(`os/path.js`)); // false
console.log(path.isAbsolute(`.`)); // false
console.log(path.isAbsolute(`..`)); // false
// 拼接路径
console.log(path.join('/Users', '.', 'wangjun', '..', 'wangjun', 'Desktop', 'file.html')); // /Users/wangjun/Desktop/file.html
// 规范化路径(解析..和.)
console.log(path.normalize('/Users/./wangjun/../wangjun/Desktop/file.html')); // /Users/wangjun/Desktop/file.html
// 解析路径
console.log(path.parse(`/Users/wangjun/Desktop/file.html`));
// { root: '/',
// dir: '/Users/wangjun/Desktop',
// base: 'file.html',
// ext: '.html',
// name: 'file' }
// 子对象
console.log(path.posix); // posix 上 path 的相关实现
console.log(path.win32); // win32 上 path 的相关实现
// 计算相对路径
console.log(path.relative('/Users/xx', '/Users/wangjun/Desktop/file.html')); // ../wangjun/Desktop/file.html
// 合并绝对路径
console.log(path.resolve('/Users/xx', '../wangjun/Desktop/file.html')); // /Users/wangjun/Desktop/file.html
// 路径分割符, windows: \ linux/mac: /
console.log(path.sep); // /