Simple cmd tool to extract and displat file attrs

T_FileAttrs.java

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.LinkOption;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.attribute.*;

public class T_FileAttrs {
	public static void print_usage() {
		System.err.println("Usage: java Javast [-s] <path to file> [<path to file> ...]");
		System.exit(1);
	}

	public static void main(String[] args) {
		boolean follow_sym = false;
		Path[] file_paths;

		switch (args.length) {
			case 0:
				print_usage();
				return;

			case 1:
				file_paths = new Path[]{Paths.get(args[0]),};
				break;

			default:
				follow_sym = args[0].equals("-s");

				file_paths = new Path[args.length - 1];

				for (int i = 1; i < args.length; i++) {
					file_paths[i - 1] = Paths.get(args[i]);
				}
		}

		if (file_paths.length > 1) {

			for (Path file_path : file_paths) {
				System.out.printf(">>> File info for \"%s\"\n", file_path);

				print_file_info(file_path, follow_sym);

				System.out.println("------------------\n");
			}

		} else {

			print_file_info(file_paths[0], follow_sym);
		}
	}

	private static void print_file_info(Path file_path, boolean follow_sym) {
		LinkOption link_options = follow_sym ? null : LinkOption.NOFOLLOW_LINKS;

		if (!Files.exists(file_path)) {
			System.out.println("(File not found)");
			return;
		}

		PosixFileAttributes attrs = null;
		try {
			attrs = Files.readAttributes(file_path, PosixFileAttributes.class, link_options);
		} catch (IOException e) {
			e.printStackTrace();
		}


		if (attrs.isRegularFile()) System.out.printf("Is Regular File\n");
		if (attrs.isDirectory()) System.out.printf("Is Directory File\n");
		if (attrs.isSymbolicLink()) System.out.printf("Is Symbolic Link\n");
		if (attrs.isOther()) System.out.printf("Is Other\n");

		long size = attrs.size();
		double k_size = size / 1024D;
		double m_size = k_size / 1024D;
		double g_size = m_size / 1024D;

		System.out.printf("Size: %d Bytes (%f KB; %f MB; %f GB)\n", size, k_size, m_size, g_size);
		System.out.printf("Creation Time: %s\n", attrs.creationTime());
		System.out.printf("Last Access Time: %s\n", attrs.lastAccessTime());
		System.out.printf("Last Modifed Time: %s\n", attrs.lastModifiedTime());

		UserPrincipal user = attrs.owner();
		GroupPrincipal group = attrs.group();

		System.out.printf("Owner: %s/%s\n", group.getName(), user.getName());
		System.out.printf("Permissions: %s\n", PosixFilePermissions.toString(attrs.permissions()));

	}
}