惨案
我一般运用敕令装置express。
$ npm install -g express-generator然后bash就提醒装置胜利
/Users/majialun/.npm-global/bin/express -> /Users/majialun/.npm-global/lib/node_modules/express-generator/bin/express-cli.js
+ express-generator@4.16.1
updated 1 package in 2.123s然后运转 express，按原理这个时刻应当让我建立项目了，然则体系提醒：
bash: express: command not found实在不光是express，我本身写的剧本，也涌现这个题目，全局装置胜利，然则，经由过程bash就是挪用不出来。
侦察
先看看全局有哪些path变量
$ echo $PATH然后就涌现了许多
/Users/majialun/.rvm/gems/ruby-2.4.1/bin:/Users/majialun/.rvm/gems/ruby-2.4.1@global/bin:/Users/majialun/.rvm/rubies/ruby-2.4.1/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Users/majialun/.rvm/gems/ruby-2.4.1/bin:/Users/majialun/.rvm/gems/ruby-2.4.1@global/bin:/Users/majialun/.rvm/rubies/ruby-2.4.1/bin:/Users/majialun/.rvm/bin:/Users/majialun/Documents/flutter/flutter/bin:/Users/majialun/.npm-global/bin/express:/Users/majialun/.rvm/bin:/Users/majialun/Documents/flutter/flutter/bin:/Users/majialun/.rvm/gems/ruby-2.4.1/bin:/Users/majialun/.rvm/gems/ruby-2.4.1@global/bin:/Users/majialun/.rvm/rubies/ruby-2.4.1/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Users/majialun/.rvm/gems/ruby-2.4.1/bin:/Users/majialun/.rvm/gems/ruby-2.4.1@global/bin:/Users/majialun/.rvm/rubies/ruby-2.4.1/bin:/Users/majialun/.rvm/bin:/Users/majialun/Documents/flutter/flutter/bin:/Users/majialun/.npm-global/bin/express:/Users/majialun/.rvm/bin:/Users/majialun/.npm-global/bin:/Users/majialun/.rvm/gems/ruby-2.4.1/bin:/Users/majialun/.rvm/gems/ruby-2.4.1@global/bin:/Users/majialun/.rvm/rubies/ruby-2.4.1/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Users/majialun/.rvm/gems/ruby-2.4.1/bin:/Users/majialun/.rvm/gems/ruby-2.4.1@global/bin:/Users/majialun/.rvm/rubies/ruby-2.4.1/bin:/Users/majialun/.rvm/bin:/Users/majialun/Documents/flutter/flutter/bin:/Users/majialun/.npm-global/bin/express:/Users/majialun/.rvm/bin:/Users/majialun/Documents/flutter/flutter/bin:/Users/majialun/.rvm/gems/ruby-2.4.1/bin:/Users/majialun/.rvm/gems/ruby-2.4.1@global/bin:/Users/majialun/.rvm/rubies/ruby-2.4.1/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Users/majialun/.rvm/gems/ruby-2.4.1/bin:/Users/majialun/.rvm/gems/ruby-2.4.1@global/bin:/Users/majialun/.rvm/rubies/ruby-2.4.1/bin:/Users/majialun/.rvm/bin:/Users/majialun/Documents/flutter/flutter/bin这个时刻我们发明太多了，然则不要慌，适才装置Express的时刻，有一个提醒显现了npm的全局剧本挂在哪一个path下。
再看看装置胜利的提醒：
/Users/majialun/.npm-global/bin/express -> /Users/majialun/.npm-global/lib/node_modules/express-generator/bin/express-cli.js
+ express-generator@4.16.1
updated 1 package in 2.123s我们能够看到，剧本装置在/Users/majialun/.npm-global/bin，这个目次里就是悉数的全局剧本，注重是bin目次，express只是这个目次下的一个罢了。
然后我们细致在全局的path里找，发明并不存在这个途径……我也不知道我是怎样把途径搞没的，我在公司的Macbook Pro一切一般，然则随身带的Macbook就缺失途径。
破案
我们直接去根目次（/Users/majialun/）下，显现隐蔽文件后，看看有无.bash_profile,没有就新建一个，有就直接修正,增加进去一个途径：
export PATH=$PATH:/Users/majialun/.npm-global/bin:$PATH注重这个途径是从上面复制下来的，每个人的不一样，总之从装置胜利的提醒里，复制到/bin这里完毕就能够了。
好了以后,在终端里打source,然后把.bash_profile 拖进来，就有了：
$ source /Users/majialun/.bash_profile 实行一下然后重启终端，跑起来碰运气：
majialun$ express
warning: the default view engine will not be jade in future releases
warning: use `--view=jade' or `--help' for additional options
destination is not empty, continue? [y/N] 没有not found 的报错，题目解决。
