java模拟执行终端命令，并打印包含指定字符的内容(适用于win、mac、linux)

    //执行命令并打印包含指定字符的内容(适用于win、mac、linux)public static void cmd(String cmd, String grepString) throws IOException {String line;BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(Runtime.getRuntime().exec(cmd).getInputStream(), StandardCharsets.UTF_8));while ((line = bufferedReader.readLine()) != null) {if (grepString.equals("")) {System.out.println(line);} else {//有需要过滤的字符串if (line.contains(grepString)) {System.out.println(line);}}}bufferedReader.close();}//执行命令并返回结果public static String cmdReturn(String cmd, String grepString) throws IOException {StringBuilder sb = new StringBuilder();String line;BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(Runtime.getRuntime().exec(cmd).getInputStream(), StandardCharsets.UTF_8));while ((line = bufferedReader.readLine()) != null) {if (grepString.equals("")) {sb.append(line).append("\n");} else {//有需要过滤的字符串if (line.contains(grepString)) {sb.append(line).append("\n");}}}bufferedReader.close();return String.valueOf(sb);}