Linux System Standard Catalog and its contents

Path name	Operating system	Content
/bin	All	The most core operating system commands
/boot	Ls	Kernel and files required to load the kernel
/dev	All	Device items for pseudo-terminals, disks, printers, etc.
/etc	All	Critical startup files and configuration files
/home	All	User's default home directory
/kernel	S	Kernel build
/lib	All	Cry, shared library and partial C compiler
/media	Ls	Mount points for file systems on removable media
/mnt	Lsa	Temporary mount points for removable media
/opt	All	Optional application package (not widely used)
/proc	Lsa	Information for all running processes
/root	Ls	Superuser's home directory (often/)
/sbin	All	Commands required to run the system at minimum size
/stand	H	Standalone tools, disk formatting tools, diagnostic tools, etc.
/tmp	All	Temporary files that disappear each time you reboot
/usr	All	Hierarchical structure of minor files and commands
/usr/bin	All	The hierarchy of most commands
/usr/include	All	Compiling header files for C programs
/usr/lib	All	Library: Support files for standard programs
/usr/lib64	L	64 libraries on 64-bit Linux distributions
/usr/local	All	Local software (software written or installed by the user);/USR mirror structure
/usr/sbin	All	Less critical system administration commands and Repair commands
/usr/share	All	Things that are common to many systems
/usr/share/man	All	Online User manual

/usr/src	Lsa	Source code for non-local packages
/usr/tmp	All	More temporary space (each reboot is still retained)
/var	All	System-specific data and configuration files
/var/adm	All	A variety of different things: logs, System setup records, strange management information
/var/log	Lsa	Various system log files
/var/spool	All	Spool directories for use by printers, mail, etc.
/var/tmp	All	More temporary space (no files to keep after reboot)

Linux System Standard Catalog and its contents