How can I master the Linux File System Hierarchy?. This is a short explanation of the Linux file system Hierarchy. In a Linux system, all files are stored on file systems. A file-system hierarchy is the organization of these files into a single inverted tree of directories. The tree of directories is said to be inverted since its root at the top of the hierarchy, and the branches of directories and sub-directories stretch below the root.
The below diagram is a Red Hat Enterprise Linux(RHEL) 8 file-system directories.
The below diagram is a Red Hat Enterprise Linux(RHEL) 8 file-system directories.
As seen in the diagram, the / is the root directory at the top of the file system tree. All other directories are separated by the / character. So var is a subdirectory of the root directory (/). How then can we describe the file-system directory contents?.
Linux File System Hierarchy Content types
These are the major types of content stored in a Linux filesystem.
1. Persistent – These are the contents which should be persistent after a reboot, e.g system and applications configuration settings.
2. Runtime – Content generated by a running process; usually deleted by a reboot
3. Variable / Dynamic – These content may be appended or modified by processes running in the Linux system.
4. Static content – This remains unchanged until explicitly edited or reconfigured.
Important Linux Directories – May vary from one distro to another
These are the standard Linux directories – This is pulled from a RHEL 8 server.
System Directory
|
Purpose
|
/etc
|
Contains configuration files used by system services
|
/root
|
This is a home directory for the Linux superuser account, root
|
/boot
|
Contains all the files needed to start the boot process.
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/home
|
This is where standard users store their personal configurations and data such as Documents, Videos, Music e.t.c.
|
/var
|
Has variable data that is required to persist between boots – databases, log files, mails, cache directories, Web data e.t.c.
|
/tmp
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Stores temporary files. All Linux users can write to this directory. Files older than 10 days are deleted automatically.
|
/usr
|
This directory contains shared libraries, installed software, and read-only program data.
Some of the important subdirectories include:
• /usr/bin: Mostly user commands are located here.
• /usr/sbin: Hosts System administrative commands that required privilege escalation to run.
• /usr/local: For locally customized software.
|
/dev
|
This contains special device files used by the system to access hardware.
|
/run
|
The processes started since the last boot stores their runtime data here, e.g. process ID files and lock files. These contents are recreated on reboot.
|
Other directories that may be symlinks to other:
◉ /bin and /usr/bin
◉ /sbin and /usr/sbin
◉ /lib and /usr/lib
◉ /lib64 and /usr/lib6
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