判断指定目录是否有文件

linux 中如何判断指定目录下是否有文件（ 包括隐藏文件和符号链接）呢？

脚本名：decide_blank_folder.sh

脚本内容：

#!/bin/sh    
# whether the specified folder has files,including symbolic file and hidden file    
is_blank_dir_yes=2    
is_blank_dir_no=5    
isHasFileInDir()    
{    
                result3=`find "$1" ! -type d`    
                if [ x"$result3" == x"" ];then    
                                return 1    
                                # has no file    
                else    
                echo "$this_dir"    
                                return 3    
                                # has file(s)    
                fi    
}    
    
is_blank_folder_compl()    
{    
                local fold_name="$1"    
                ls "$fold_name" >/dev/null 2>&1    
                if [ $? -ne 0 ];then    
                                return 4    
                                # has no this folder    
                fi    
                local result=`ls -A "$fold_name"`    
                if [ x"$result" == x"" ];then    
                                return $is_blank_dir_yes    
                                # is blank    
                 else    
                                for i in `find "$fold_name" ! -type d`;do    
                                                return $is_blank_dir_no    
                                done    
                                #init_bool=5    
    
                                return $is_blank_dir_yes    
                 fi    
}    
    
if [ -z "$1"    ];then    
        echo "no argument";    
                exit 255    
fi    
    
is_blank_folder_compl "$1"    
retval=$?    
echo "return value: $retval"    
if [ $retval -eq $is_blank_dir_yes ];then    
                echo "has no file(s)"    
else    
                if [ $retval -eq $is_blank_dir_no ];then    
                                echo "has file......."    
                fi    
fi    

测试如下：

[root@localhost test]# ./decide_blank_folder.sh abc/

return value: 2

has no file(s)

 

知识点补充：

（1）如何查看隐藏文件？

使用ls -A

 

(2)`find "$fold_name" ! -type d` 中的感叹号表示什么？

表示否定，即搜索除文件夹之外的所有内容，搜索时排出文件夹。