Linux学习笔记3.2-bash特性详解

import java.io.*;
public class CountBytes {
public static void main(String[] args) throws IOException{

InputStream in;
if(args.length==0)
in=System.in;
else
in=new FileInputStream(args[0]);
int total=0;
while(in.read()!=-1)
total++;
System.out.println(total+"bytes");

}
}