ls -alh
$ ls -alh
-l: (list) Display in list form
-a: (all) Display all files, including hidden files
-h: (human readable) Display file size in human readable form
About file types
dIs a catalog file, lis a link file, -is an ordinary file, pis a pipeline
About r w xthe chmodvalue will be used when modifying file permissions
r=4, w=2, x=1
About the number of hardware links
文件链接数The concept in the picture is wrong. After checking the information, the correct statement is 硬链接数that when the number of hard links is 0, the file does not exist