Linux Folders & Logs

/var/log # System log files

Folder Structure

/
├── bin
├── boot
├── dev
├── etc
├── home
├── lib
├── media
├── mnt
├── opt
├── proc
├── root
├── run
├── sbin
├── srv
├── sys
├── tmp
├── usr
└── var

Directory	Purpose
/	Root of the entire filesystem
/bin	Essential user commands (e.g., ls, cp, cat)
/sbin	System administration commands
/boot	Bootloader files and Linux kernel
/dev	Device files (disks, terminals, USB devices)
/etc	System-wide configuration files
/home	User home directories (/home/alice)
/root	Home directory of the root user
/lib, /lib64	Shared libraries needed by programs
/media	Mount points for removable media (USB drives, CDs)
/mnt	Temporary mount points
/opt	Optional third-party software
/proc	Virtual filesystem containing process and kernel information
/run	Runtime data for processes
/srv	Data served by system services (web, FTP, etc.)
/sys	Kernel and hardware information
/tmp	Temporary files
/usr	User programs, libraries, documentation
/var	Variable data such as logs, caches, mail, databases

/etc/group stores all groups and ids of linux and which users are part them
/etc/sudoers stores groups that have sudo privilages like /etc/sudoers.d/

/etc/passwd # User account information
/var/log # System log files
/usr/bin # Most executable programs