即使作为 su 也无法处理某些文件：“-rw-r--r--”与“-rw-r--r-”

Question

我有几个无法处理的文件（例如head filename给我head: filename: Permission denied）。

xattr这些文件不显示/不执行任何操作。

以下是一个示例会话：

vlad@MacBook-03:~/html$ ls *.html | wc -l 
     979

vlad@MacBook-03:~/html$ head -1 *.html > /dev/null
head: 6a69505d39eed3aca809c75519e59c53.html: Permission denied
head: adc6fa4dae0ec2902775fe51806e51aa.html: Permission denied
head: c9f71486e1f27551d99940b460b699f4.html: Permission denied

vlad@MacBook-03:~/html$ echo "As you see, only 3 out of 979 files are 'strange'" 
As you see, only 3 out of 979 files are 'strange'

# Strange access attributes:
vlad@MacBook-03:~/html$ ll | cut -f1 -d" "| sort | uniq -c | sort -n
   1 drwxr-xr-x
   1 drwxrwxrwx
   1 total
   3 -rw-r--r--
 979 -rw-rw-rw-

vlad@MacBook-03:~/html$ ll  6a69505d39eed3aca809c75519e59c53.html
-rw-rw-rw-  1 vlad  staff  42316 Jul 20 03:17:45 2010 6a69505d39eed3aca809c75519e59c53.html


vlad@MacBook-03:~/html$ sudo head 6a69505d39eed3aca809c75519e59c53.html
Password:
head: 6a69505d39eed3aca809c75519e59c53.html: Permission denied

请帮忙。MacOS 10.15.7。谢谢！