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Linux : directory structure

/ - The Root Directory

/bin - Essential User Binaries
that must be present when the system is mounted in single-user mode.. sbin is similar

/boot - static boot files


/etc - Configuration files
contains system-wide configuration files.
unlikely, user-specific configuration files are located in each user's home directory

/home - Home Folders
contains a home folder for each user. for example

/lib - Essential shared libraries
contains libraries needed by the essential binaries in the /bin and /sbin folder.


/root - Root home directory
is the home directory of the root user. instead of being located at /home/root, its located at /root,
this is distinct from /, which is the system root directory.

/sbin - System Administration Binaries
essential binaries that are generally intended to be run by the root user for system administration.

$
dollar sign means that you are a normal user

#
hash means that you are the system administrator(root)

~
tilde means home directory.


source :
https://www.howtogeek.com/117435/htg-explains-the-linux-directory-structure-explained/

about $#~

https://askubuntu.com/questions/706186/difference-between-and-in-linux-environment
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