从 NodeJS 捕获 bash 输出
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Capturing bash output from NodeJS
提问by Ahmed Nuaman
Is it possible to start and continue to capture output from a certain bash process with node? For example: say I was run tail /some/file, how can I keep listening to every new line printed and act on the output?
是否可以使用节点启动并继续捕获某个 bash 进程的输出？例如：假设我是 run tail /some/file，我怎样才能继续收听打印的每一行新行并对输出采取行动？
回答by Andrey Sidorov
var spawn = require('child_process').spawn,
tail = spawn('tail', ['-f', '/tmp/somefile']);
tail.stdout.pipe(process.stdout);
child_process module is well documented
child_process 模块有据可查
回答by Dominic Barnes
For completeness, I've added this answer as well.
为了完整起见，我也添加了这个答案。
You can use child_process.spawnto spawn a process and monitor it's output. However, for a command like tail, cat, etc that don't run long or continuously you can just use child_process.execand it will capture the entire output for stdoutand stderrand give it to you all at once.
您可以使用child_process.spawn来生成一个进程并监视它的输出。但是，对于像 tail、cat 等不会长时间或连续运行的命令，您可以使用child_process.exec它，它会为stdout和捕获整个输出并stderr一次性将其全部提供给您。
var cp = require("child_process");
cp.exec("tail /some/file", function (err, stdout, stderr) {
// If an error occurred, err will contain that error object
// The output for the command itself is held in stdout and stderr vars
});
