Cfxtrjtrk

I am confused. Linux filesystem is a tree structure, with the root node(starting node) as the root directory.
Now let's suppose I have a folder abc at location /home/abc and another folder xyz at location /home/xyz

Folder xyz consists of some other folders and files inside it. (ex def and mno are folders inside it)

     xyz

    /   

   def   mno

When I run the command

mount --rbind /home/xyz /home/abc

(rbind is recursively bind)
I see all the contents of the folder xyz in abc.
Now, when i just run the command

mount --bind /home/xyz /home/abc

I still see all the contents of xyz in abc.

Why is that?

--bind to work just as similarly to --rbind

Read man 8 mount. It says:

Bind mounts

       Remount part of the file hierarchy somewhere else.  The call is:



              mount --bind olddir newdir



       or by using this fstab entry:



              /olddir /newdir none bind



       After this call the same contents are accessible in two places.  One can  also  remount  a

       single  file  (on  a  single  file).  It's also possible to use the bind mount to create a

       mountpoint from a regular directory, for example:



              mount --bind foo foo



       The bind mount call attaches only (part of) a single filesystem, not  possible  submounts.

       The entire file hierarchy including submounts is attached a second place by using:

Bind mounts

       Remount part of the file hierarchy somewhere else.  The call is:



              mount --bind olddir newdir



       or by using this fstab entry:



              /olddir /newdir none bind



       After this call the same contents are accessible in two places.  One can  also  remount  a

       single  file  (on  a  single  file).  It's also possible to use the bind mount to create a

       mountpoint from a regular directory, for example:



              mount --bind foo foo



       The bind mount call attaches only (part of) a single filesystem, not  possible  submounts.

       The entire file hierarchy including submounts is attached a second place by using:



              mount --rbind olddir newdir



       Note that the filesystem mount options will remain the same as those on the original mount

       point.

              mount --rbind olddir newdir



       Note that the filesystem mount options will remain the same as those on the original mount

       point.