$ ls -l
-rw-r--r--  1 root root 3 Jun 29 15:35 a.log
drwxr-xr-x  2 root root 2 Jun 30 18:06 dir

#Permission analysis of "dir"

d  rwx  r-x  r-x
┬  ─┬─  ─┬─  ─┬─  
│   │    │    │  
│   │    │    └─ 4. Other|5 (4+0+1)
│   │    └────── 3. Group|5 (4+0+1)
│   └─────────── 2. User |7 (4+2+1)
└─────────────── 1. File Type | directory
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