[英]How to detect if Node's process.stdout is being piped?
Is there any way I can detect if the output from my Node.js script is being piped to something other then the terminal? 有什么方法可以检测我的Node.js脚本的输出是否被管道传输到终端以外的其他东西?
I would like some way of detecting if this is happening: 我想要一些方法来检测是否发生这种情况:
node myscript.js | less
Or if this is happening: 或者如果发生这种情况:
node myscript.js
The easiest way would be process.stdout.isTTY
(0.8 +): 最简单的方法是
process.stdout.isTTY
(0.8 +):
$ node -p -e "Boolean(process.stdout.isTTY)"
true
$ node -p -e "Boolean(process.stdout.isTTY)" | cat
false
(example from the official documentation) (来自官方文档的例子)
Alternatively you can use the tty
module for finer grained control: 或者,您可以使用
tty
模块进行更精细的控制:
if (require('tty').isatty(1)) {
// terminal
}
you can check whether stdout of running process is piped by looking where its file descriptor points, for example like below 您可以通过查看其文件描述符指向的位置来检查运行进程的stdout是否通过管道传输,例如如下所示
readlink /proc/<your process id>/fd/1
or, more specifically 或者,更具体地说
[[ $(readlink /proc/$(pgrep -f 'node myscript.js')/fd/1) =~ ^pipe ]] && echo piped
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