使用 Java ProcessBuilder 执行管道命令
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Using Java ProcessBuilder to Execute a Piped Command
提问by user455889
I'm trying to use Java's ProcessBuilderclass to execute a command that has a pipe in it. For example:
我正在尝试使用 Java 的ProcessBuilder类来执行一个包含管道的命令。例如：
ls -l | grep foo
However, I get an error:
但是，我收到一个错误：
ls: |: no such file or directory
Followed by:
其次是：
ls: grep: no such file or directory
Even though that command works perfectly from the command line, I can not get ProcessBuilderto execute a command that redirects its output to another.
即使该命令从命令行完美运行，我也无法ProcessBuilder执行将其输出重定向到另一个命令的命令。
Is there any way to accomplish this?
有什么办法可以做到这一点吗？
回答by Jon Skeet
The simplest way is to invoke the shell with the command line as the parameter. After all, it's the shell which is interpreting "|" to mean "pipe the data between two processes".
最简单的方法是使用命令行作为参数调用shell。毕竟，解释“|”的是shell 意思是“在两个进程之间传输数据”。
Alternatively, you could launch each process separately, and read from the standard output of "ls -l", writing the data to the standard input of "grep" in your example.
或者，您可以单独启动每个进程，并从“ls -l”的标准输出中读取，将数据写入示例中“grep”的标准输入。
回答by dogbane
This should work:
这应该有效：
ProcessBuilder b = new ProcessBuilder("/bin/sh", "-c", "ls -l| grep foo");
To execute a pipeline, you have to invoke a shell, and then run your commands inside that shell.
要执行管道，您必须调用一个 shell，然后在该 shell 中运行您的命令。
