java Runtime exec执行含管道符的shell命令无效的问题
源于一个例子,java执行shell top命令,代码如下:
// SysInfo.java
import java.io.*;public class SysInfo {
public static void main(String[] args) throws Exception { Runtime rt = Runtime.getRuntime();
Process p = rt.exec("top -b -n 1");
BufferedReader in = new BufferedReader(new InputStreamReader(p.getInputStream()));
String str = null;
while ((str = in.readLine()) != null) {
System.out.println(str);
}
}
}这段代码会正常输出,但是如果将rt.exec("top -b -n 1")改为rt.exec("top -b -n 1 | grep top"),就没有输出了,单独将"top -b -n 1 | grep top"在terminal执行是没问题的。
exec执行含管道符的命令无效?原理不是太明确,根据解决方法看应该与命令的字符串有关。解决方法:
linux下:
String[] command = { "/bin/sh", "-c", "top -b -n 1 | grep top"};
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