使用 node.js 将输出重定向到日志文件
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Redirecting output to a log file using node.js
提问by user220755
I have a child process that I am using as follows in node.js. Instead of redirecting the output to the console I would like to put the output in a log file located somewhere on the machine this is running on (and should work for both windows and mac).
我有一个子进程，我在 node.js 中使用如下。而不是将输出重定向到控制台，我想将输出放在位于正在运行的机器上某处的日志文件中（并且应该适用于 windows 和 mac）。
The code below is what I am using and I would like to output the files into a log file. What changes needed to do that here? Thanks!
下面的代码是我正在使用的代码，我想将文件输出到日志文件中。在这里需要做哪些改变？谢谢！
My Code:
我的代码：
var spawn = require('child_process').spawn,
ls = spawn('ls', ['-lh', '/usr']);
ls.stdout.on('data', function (data) {
console.log('stdout: ' + data);
});
ls.stderr.on('data', function (data) {
console.log('stderr: ' + data);
});
ls.on('close', function (code) {
console.log('child process exited with code ' + code);
});
采纳答案by user220755
The best answer was in the comments and is mentioned in a previous question here: stackoverflow.com/questions/2496710/nodejs-write-to-file
最好的答案是在评论中，并在上一个问题中提到：stackoverflow.com/questions/2496710/nodejs-write-to-file
It is as follows:
如下：
var fs = require('fs');
fs.writeFile("/tmp/test", "Hey there!", function(err) {
if(err) {
console.log(err);
} else {
console.log("The file was saved!");
}
});
回答by generalhenry
Here's an example of logging to file using streams.
这是使用流记录到文件的示例。
var logStream = fs.createWriteStream('./logFile.log', {flags: 'a'});
var spawn = require('child_process').spawn,
ls = spawn('ls', ['-lh', '/usr']);
ls.stdout.pipe(logStream);
ls.stderr.pipe(logStream);
ls.on('close', function (code) {
console.log('child process exited with code ' + code);
});
回答by swogger
If you run your JS script with foreverthen you have the option to define a log file as parameter which will handle all your console.log messages. Not to mention the benefit of keeping your nodejs app live permanently.
如果你运行你的 JS 脚本，forever那么你可以选择定义一个日志文件作为参数来处理你的所有 console.log 消息。更不用说让您的 nodejs 应用程序永久运行的好处了。
Alternatively try this:
或者试试这个：
sudo forever start myapp.js 2>&1 /home/someuser/myapp/myapp.log
回答by fatih tekin
use forever with below options
使用以下选项永远使用
forever start -o out.log -e err.log server.js
永远开始 -o out.log -e err.log server.js
