FILE SYSTEM (FHS)

Linux File System 
Red Hat Linux has a hierarchical file system. The top-most directory—known as the root directory—of the file system contains several other directories, sometimes called sub-directories. Basic File system Hierarchy Standard (FHS) Directories.

/
The root directory, the top-level directory in the FHS. All other directories are sub-directories of root, which is always mounted on some partition.
/bin
Contains binary executable files used by user, administrator, and operating system.
/boot
Contains file required for booting the system
/dev
Contains files associated with the devices attached to the system
/etc
Contains configuration files of the application in the system.
/lib
Contains library files required by the executable files stored in /bin directory.
/media
Contains mount point for the removable media attached to the system
/mnt
Contains mount points for mounted file system.
/opt
Contains third party software application.
/proc
Contains files that represent the current state of kernel.
/sbin
contains binary executable files used for system booting and recovery operation and not accessed by regular user.
/srv
Contains data files used by services, such as WWW and FTP
/sys
Contains files that represent the state of the kernel.
/usr
Contains user related files, program, and documentation.
/var
Contains log files, error messages, cache data and other files.
/tmp
Contains temporary files created by application, which are deleted at system reboot.
/home
Each user on the system has a home directory. It is the location where the user arrives first logging in to the system.
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