java执行linux命令
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java executing linux command
提问by Roman Iuvshin
I`m trying to execute linux commant 'cat' from java code, but it does not working.
我正在尝试从 java 代码执行 linux 命令“cat”，但它不起作用。
Runtime.getRuntime().exec("cat /home/roman/logs/*");
And it working well for cat of single file
它适用于单个文件的猫
Runtime.getRuntime().exec("cat /home/roman/logs/mylog.log");
My question is how to cat all files on some dir from java ?
我的问题是如何从 java 中抓取某个目录上的所有文件？
采纳答案by Yuval
You could put all files under the dir into a collection and iterate over it:
您可以将目录下的所有文件放入一个集合中并对其进行迭代：
File[] files = dir.listFiles();
for (File f : files) {
Runtime.getRuntime().exec("cat "+dir.getAbsolutePath()+File.separator+f.getName());
}
回答by talnicolas
You can't use *with the exec()command (you would need a shell). A solution could be to write a script and then exec()that script from your java application.
您不能*与exec()命令一起使用（您需要一个 shell）。一个解决方案可能是编写一个脚本，然后exec()从您的 Java 应用程序编写该脚本。
回答by user1225148
Runtim.exec() does not use a shell to execute the command. Therefore the wildcard is not expanded. Try the solution explained in Want to invoke a linux shell command from java
Runtim.exec() 不使用 shell 来执行命令。因此通配符没有扩展。尝试从 java 调用 linux shell 命令中解释的解决方案
