我想将 cmd 输出写入文件而不是 stdout

Question

我可以在 node.js 中使用 child-process 和 spawn cmd，我希望将此命令的输出写入文件而不是 stdout。测试.jsconst expect = require('chai').expect;const { spawn } = require('child_process')let path = require('path');let fs = require('fs');//tried but didn't work 1) const cmd = spawn(ansysfnonetclient, options, {    stdio: [      0, // Use parent's stdin for child.      'pipe', // Pipe child's stdout to parent.      fs.openSync('err.out', 'w') // Direct child's stderr to a file.    ]  });2)  const cmd = spawn(ansysfnonetclient, options,  {shell: true, stdio: 'inherit'});it('run the cmd and write o/p to file', function (done) {  this.timeout(30000);  let options = ['-h','-o','temp.log']; let ansysfnonetclient = path.resolve(__dirname,'../../../../../../../../saoptest/annetclient.exe'); const cmd = spawn(ansysfnonetclient, options,  {shell: true, stdio: 'inherit'}); console.log(cmd); done();});

Answer 1

stdio 选项传递 3 个“文件”：

• 输入

• 输出

• 错误输出

如果要将常规输出通过管道传输到文件，则必须将该文件作为第二项传递stdio：

const { spawn } = require('child_process');

const fs = require('fs');

const stdio = [

  0,

  fs.openSync('std.out', 'w'),

  fs.openSync('err.out', 'w')

];

const child = spawn('echo', ['hello world!'], {stdio});

在https://nodejs.org/api/child_process.html#child_process_options_stdio阅读更多相关信息。

Answer 2

const expect = require('chai').expect;

const { spawn } = require('child_process')

let path = require('path');

let fs = require('fs');

```

const cmd = spawn(ansysfnonetclient, options,  {shell: true, stdio: 'inherit'});

cmd.stdout.on('data',function(chunk) {

fs.writeFile(path.resolve(__dirname,'../../../../../../../../output.log'), chunk.toString(), function(err) {

  if(err) 

  {

    return console.log(err);

  }

  console.log("The file was saved!");

}); 

```