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The root directory is usually /.
Vi
The /, or root directory.
The Linux Filesystem Hierarchy is used to help determine the file structure in the Linux Operating System. It defines the Directory structure and directory contents.
utilities is nothing but predefined commands in linux
Var directory is a sub directory of the root directory, The system writes data during process of its operation.
For linux file system creation there are many utilities.Example commands and utilities to create partitions:fdiskcfdiskcgdiskpartedGPartedFile system types:NTFSextext2ext3ext4swapfatbtrfs...All basically does the same with slight added or reduced functionality
Linux is just the kernel. If you combine utilities that were made as a result of the GNU project with the linux kernel, you get GNU Linux, which is considered as a complete operating system
/var/log
Software that includes an operating system as well as utilities is called an operation system package. Two examples of this type of software system are Windows and Linux.
C. Distribution :)
Many distributions have documentation or builtin graphical installation utilities.