在java中执行awk命令 [英] Executing awk command in java

问题描述

我正在尝试在java中为linux / unix操作系统执行awk命令，但问题是当我执行命令时它没有显示任何错误。但是执行后没有输出，只需要几分之一秒来执行i不知道问题请帮忙。

i am trying to execute awk command in java for linux/unix os but the thing is when i execute the command it does not show any error it.But after execution there is no output and it takes fraction of second to execute i dont know the problem please help .

代码是

process p =new process():
yes = "awk '{print $1}' /root/Desktop/net/net.zone >> /root/Desktop/net/net.txt";
p = Runtime.getRuntime().exec(yes);

感谢您的帮助

推荐答案

使用Java正确启动命令行进程并不容易。我建议您使用 commons-exec 而不是自己尝试。

Starting command line processes correctly with Java isn't easy. I suggest you use commons-exec instead of trying it yourself.

现在命令行中有两件事需要特殊处理：

Now you have two things in the command line which need special handing:

• 单引号AWK脚本。当您通过 addArgument 将每个参数作为单个字符串传递给 CommandLine 时，您不再需要引号。



• 输出重定向。

• Single quotes around the AWK script. When you pass each argument as a individual strings to CommandLine via addArgument, you don't need the quotes anymore.

• The output redirection.

由于您创建了子进程，因此您可以控制stdin和stout。这意味着您需要打开目标文件以便在Java中追加，将其包装在 PumpStreamHandler 中并将其传递给 DefaultExecutor 。有关详细信息，请参阅此问题： apache-commons exec的处理输出

Since you create a child process, you are in control of stdin and stout. That means you need to open the target file for append in Java, wrap it in a PumpStreamHandler and pass that to DefaultExecutor. See this question for details: Process output from apache-commons exec

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