如何从控制台将无限 stream (bash) 转换为 java args？

Question

consider the following java program:

class PrintName{
    public static void main(String[] args){
        System.out.println("Hi " + args[0]);
    }
}

Now I just compile and execute it from console (I'm on Ubuntu server):

~$:javac PrintName.java
~$:java PrintName "Fernando"

I get the next output:

Hi Fernando

I know there are commands like 'yes' in Linux, with which I can get infinite stream of data. My idea is to do something like this:

yes "Fernando" | java PrintName >> my_file.txt

I want to be able to pass "infinite" Fernando's to my program and have it run infinitely many times, then be able to manipulate the STDO to redirect to some file.

I don't know if I explained it clearly, sorry for my poor handling of the English language. Thank you very much for your time.

Answer 1

This is where you want the xargs command:

yes Fernando | xargs java PrintName

xargs takes each line of stdin, and passes it as command line arguments to the given command.

To redirect it to a file, you can wrap that in a grouping construct:

{ yes Fernando | xargs java PrintName; } >> my_file.txt