A diagram of a typical directory tree for a Unix System
Special files for physical devices: system console, terminals, disk drives, line printer, etc. dev bin Executable utility programs: compilers, assembler, editors, program development lib Libraries of system utilities and subroutines: Fortran and C run-time support, system calls, I/O routines root etc Restricted system data and dangerous utility programs restricted to system manager: password file, login tmp Temporary (scratch) files used by the various system utilities: editor, compilers assembler bin Less-used utility programs tmp Less-used temporary files dict Word lists, spelling checker lib Less-used library files usr man Directories to text files containing the full Unix Programmer's manual spool at--Timed processors / lpd-- lp directory user1 User directory structure user2 User directory structure userN User directory structure
Table taken from Fig3.2 of Unix System Guide book