Npm install failed with “cannot run in wd”

　　Linux环境下，root账户，安装某些npm包的时候报下面的错误，例如安装grunt-contrib-imagemin时：

Error: EACCES, mkdir '/usr/local/lib/node_modules/coffee-script'
npm ERR!  { [Error: EACCES, mkdir '/usr/local/lib/node_modules/coffee-script']
npm ERR!   errno: 3,
npm ERR!   code: 'EACCES',
npm ERR!   path: '/usr/local/lib/node_modules/coffee-script',
npm ERR!   fstream_type: 'Directory',
npm ERR!   fstream_path: '/usr/local/lib/node_modules/coffee-script',
npm ERR!   fstream_class: 'DirWriter',
npm ERR!   fstream_stack:
npm ERR!    [ 'DirWriter._create                 (/usr/local/lib/node_modules/npm/node_modules/fstream/lib/dir-writer.js:36:23)',
npm ERR!      '/usr/local/lib/node_modules/npm/node_modules/mkdirp/index.js:37:53',
npm ERR!      'Object.oncomplete (fs.js:297:15)' ] }
npm ERR!
npm ERR! Please try running this command again as root/Administrator.

　　解决办法如下：

执行npm install命令时加上--unsafe-perm选项：
```
[sudo] npm install --unsafe-perm
```
或者将unsafe-perm选项添加到package.json文件中：
```
"config": {
"unsafe-perm":true
}
```
不要使用preinstall脚本来安装全局模块，你可以单独安装它们然后在非root账户下安装其它模块，就像下面这样：
```
sudo npm install -g coffee-script node-gyp
npm install
```

　　具体内容可以看下面这两个页面的介绍：

https://docs.npmjs.com/misc/scripts#user

https://docs.npmjs.com/getting-started/fixing-npm-permissions

　　大致意思就是说：如果npm是在root账户下执行的话，它会将uid改成当前账户，或者uid的值从user配置文件中获取，而默认情况下uid的值为nobody。所以在root账户下运行npm install时需要将unsafe-perm选项加上。

更多专业前端知识，请上【猿2048】www.mk2048.com

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