java写一个算法，分析shell语法是否正确

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class ShellSyntaxAnalyzer {
    public static void main(String[] args) {
        // 从标准输入读取shell语法
        try (BufferedReader reader = new BufferedReader(new InputStreamReader(System.in))) {
            String shellSyntax = reader.readLine();
            boolean isSyntaxCorrect = analyzeShellSyntax(shellSyntax);
            if (isSyntaxCorrect) {
                System.out.println("Shell 语法正确");
            } else {
                System.out.println("Shell 语法错误");
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static boolean analyzeShellSyntax(String shellSyntax) {
        String[] keywords = {"rm", "cp", "mv", "touch", "cd", "ls", "mkdir", "echo", "grep", "cat"};

        // 拆分shell语法为命令和参数
        String[] parts = shellSyntax.trim().split("\\s+", 2);
        String command = parts[0];

        // 检查命令是否合法
        boolean isCommandValid = false;
        for (String keyword : keywords) {
            if (command.equals(keyword)) {
                isCommandValid = true;
                break;
            }
        }

        if (!isCommandValid) {
            return false;
        }

        // 如果有参数，则检查参数是否以合法字符开头
        if (parts.length > 1) {
            String arguments = parts[1];
            char[] firstChars = arguments.toCharArray();

            for (char c : firstChars) {
                if (!Character.isLetterOrDigit(c) && c != '_') {
                    return false;
                }
            }
        }

        return true;
    }
}