我尝试安装Gulp（在root access下），但在日志中失败了。
49 error error rolling back Error: Refusing to delete: /bin/gulp not in /lib/node_modules/gulp-cli
49 error error rolling back at clobberFail (/usr/lib/node_modules/npm/lib/utils/gently-rm.js:41:12)
49 error error rolling back at next (/usr/lib/node_modules/npm/lib/utils/gently-rm.js:27:14)
49 error error rolling back at /usr/lib/node_modules/npm/lib/utils/gently-rm.js:36:12
49 error error rolling back at Object.oncomplete (fs.js:108:15)
49 error error rolling back gulp-cli@1.2.1 { [Error: Refusing to delete: /bin/gulp not in /lib/node_modules/gulp-cli] code: 'EEXIST', path: '/bin/gu$
50 error Refusing to delete: /bin/gulp not in /lib/node_modules/gulp-cli