#!/bin/bash

if [ -d '$1' ]; then echo '$1 is a directory.' elif [ -f '$1' ]; then echo '$1 is a file.' else echo '$1 is not a valid file or directory.' fi

这个脚本接受一个参数，可以是文件或目录的路径

如果参数是目录，输出“xxx is a directory.”

如果参数是文件，输出“xxx is a file.”

如果参数不是有效的文件或目录，输出“xxx is not a valid file or directory.”