节点查看是否已安装程序 [英] Node see if Program is installed

问题描述

您好，我正在制作需要以下内容的节点应用程序:ffmpeg, node-acoutstid with fpcalc and eye3D. 现在是我的问题，如何查看客户端计算机上是否安装了这些程序".

Hello im making a node app that requires: ffmpeg, node-acoutstid with fpcalc and eye3D. Now is my question how i can see if those 'programs' are installed on the clients machine.

什么是最好的检查方法?

whats the best way to check this ?

推荐答案

掏空"进行本机检测

在macOS/Linux/bash中，我们通常会使用type -p或command -v(如果您做错了，请使用which).

"shell out" for native detection

In macOS / Linux / bash we'd typically use type -p or command -v (or which if you're doing it wrong).

在Windows中，您可以像where node.exe一样使用where.

In windows there's where that you can use like where node.exe.

require('child_process').exec('type -p mything', function (err, stdout) {
  console.log(stdout);
});

如果您不想跨平台兼容并且不必担心清理用户输入，那么这种天真的方法就可以工作.

This naive approach can work if you're not trying to be cross-platform compatible and if you don't have to worry about sanitizing user input.

在npm上有一个软件包 command-exists .我偷看了一下代码，看起来它可能是最简单的跨平台检测，可以覆盖小尺寸的边缘情况:

On npm there's a package command-exists. I peeked at the code and it looks like it's probably the simplest cross-platform detection that covers edge cases at a small size:

https://github.com/mathisonian/command-exists/blob/master/lib/command-exists.js

var commandExists = require('command-exists');

// invoked without a callback, it returns a promise
commandExists('ls').then(function (command) {
  // proceed
}).catch(function () {
  // command doesn't exist
});

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