ls -ldi /etc/. /etc/..
-l use a long listing format
-d, --directory
list directory entries instead of contents, and do not dereference symbolic links
-i, --inode
print the index number of each file
$ ls -ldi /etc/. /etc/..
391681 drwxr-xr-x. 113 root root 12288 Jun 22 19:25 /etc/.
2 dr-xr-xr-x. 24 root root 4096 Jun 22 15:51 /etc/..
^ ^
| |
inode number directory entry
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