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Java running linux command

I am trying to execute linux commant 'cat' from java code but it doesn't work.

Runtime.getRuntime().exec("cat /home/roman/logs/*");

And it works well for a single file cat

Runtime.getRuntime().exec("cat /home/roman/logs/mylog.log");

My question is how to get all the files in some directory from java?

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3 answers


You can put all files under a directory in a collection and loop over it:



File[] files = dir.listFiles();
for (File f : files) {
  Runtime.getRuntime().exec("cat "+dir.getAbsolutePath()+File.separator+f.getName());
}
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You cannot use *

with a command exec()

(you need a shell). The solution could be to write a script and then exec()

which script from your java application.



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Runtim.exec () does not use a shell to execute the command. Therefore, the wildcard is not expanded. Try the solution in Want to invoke linux shell command from java .

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