Express.js:否这样的文件或目录 [英] Express.js: No Such file or directory

问题描述

我用apt-get install nodejs安装了节点.然后我用apt-get install npm安装了npm.现在，当我尝试运行express时，我会得到

I installed node with apt-get install nodejs. Then I installed npm with apt-get install npm. Now when I try to run express I get

$ express 
/usr/bin/env: node: No such file or directory

如何解决此错误?

推荐答案

Ubuntu中有两个名称相似的软件包，分别是 node 和 nodejs .

There are two package in Ubuntu that have similar names, node and nodejs.

node做到了，

说明:业余分组无线节点程序.该节点程序接受TCP/IP和分组无线网络连接，并为用户提供一个接口，使他们可以使用各种业余无线协议与远程主机建立网关连接.

Description-en: Amateur Packet Radio Node program. The node program accepts TCP/IP and packet radio network connections and presents users with an interface that allows them to make gateway connections to remote hosts using a variety of amateur radio protocols.

nodejs这样做

描述:基于Node.js事件的服务器端JavaScript引擎Node.js在设计上与Ruby的Event Machine或Python的Twisted之类的系统相似，并受其影响.它使事件模型更进一步-将事件循环作为一种语言构造而不是作为一个库来呈现. Node.js捆绑有一些有用的库来处理服务器任务:系统，事件，标准I/O，模块，计时器，子进程，POSIX，HTTP，多部分解析，TCP，DNS，断言，路径，URL，查询字符串.

Description-en: Node.js event-based server-side javascript engine Node.js is similar in design to and influenced by systems like Ruby's Event Machine or Python's Twisted. It takes the event model a bit further - it presents the event loop as a language construct instead of as a library. Node.js is bundled with several useful libraries to handle server tasks : System, Events, Standard I/O, Modules, Timers, Child Processes, POSIX, HTTP, Multipart Parsing, TCP, DNS, Assert, Path, URL, Query Strings.

Fedora也遵循类似的软件包命名方案.因此，必须将nodejs中的二进制文件从原始node重命名为nodejs.但是，从技术上讲，这不是可理解的:大多数nodejs程序(以及随npm安装的库)都假定节点二进制文件为node.如果您想解决这个问题，最简单的方法就是将两者符号链接在一起.如果采用这种方式，请不要安装用于处理业余分组无线电的node软件包.

Fedora also follows a similar package naming scheme. Because of this, the binary in nodejs had to be renamed to nodejs from the original node. However, this isn't technically kosher: and most nodejs programs (and libraries installed with npm) assume that the node binary is node. If you want to get around this the easiest way is just symlink the two together. If you take this route, don't install the node package which handles the Amateur Packet Radio stuff.

sudo ln -s /usr/bin/nodejs /usr/local/bin/node

或者，对于节点，我建议使用 n 而不安装node.只需安装npm(将安装节点)，然后删除npm，然后告诉apt清理它即可.为此，只需运行

Alternatively, in the case of node, I'd suggest using n and not installing node. Just install npm (which will install node), then remove npm, then tell apt to clean it up. To do this, simply run

sudo apt-get install npm
sudo npm install -g n
sudo n latest
sudo apt-get --purge remove npm
sudo apt-get autoremove

还有其他二进制发行版管理器，甚至可以使用像nvm这样的shell脚本工作，但我个人更喜欢n.认为n就像是只适合一件事的工具:它安装到/usr/local/bin的节点二进制文件.

There are other binary distro managers that even work from a shell script like nvm but I personally prefer n. Think of n like an apt for just one thing: the node binary which it installs to /usr/local/bin.

为什么要删除npm?不是. apt-get --purge remove只能 删除软件包管理器安装的内容. n latest在程序包管理器之外工作.如果执行此操作，则有两个npm，

Why are removing npm? We're not. apt-get --purge remove can only ever remove things installed by the package manager. n latest works outside of the package manager. There are two npms if you do this,

发行版(Debian/Ubuntu)使用apt-get安装的
1. 版本.
2. 版本由n latest安装.

1. version installed by the distro (Debian/Ubuntu) using apt-get.
2. version installed by n latest.

使用发行版的旧版本毫无意义.而且，甚至更糟的是，如果该版本有效，它可能会安装到其他位置，并在其中进行Debian修改，以采用Debian安装目录.最好同时使用一个或多个，但不要同时使用.

No point in having the distro's older version. And, even worse, if that version works it can potentially install to a different location and have Debian modifications in it that assume Debian install directories. It's better to use either/or but not both.

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