| Main directory | Sub Dir1 | Sub dir2 | Sub dir3 | Description |
| / | | | | Known as root, It contains the Linux main directories. |
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/bin | | | It contains all essential executables files of the linux system, that can used by the all linux system users(such as: ls,mount,chmod.. etc) |
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/boot | | | It contains linux booting related files, that allows to linux start up. |
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/dev | | | It contains files realted to attached peripherals (such as: keyboard, camera etc) |
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/etc | | | It contains the administrator related commands and files (such as : passwd, .config files, group, inittab). |
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/etc/X11 | | It contains the specific files for the configuration of X. |
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/etc/opt | | It contains the configuration files for the applications installed in /opt |
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/home | | | It is the personal user directory, where user can create their directories |
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/lib | | | It contains the shared libraries that are necessary for the system during booting process. |
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/mnt | | | It contains the mount points of external devices. |
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/opt | | | It contains packages of supplementary applications. |
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/root | | | It contains the directories that are related to the root administrator. |
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/sbin | | | It contains the system binary files. |
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/tmp | | | It contains temporary files & directories. |
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/usr | | | Secondary hierarchy |
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/usr/X11R6 | | It is is reserved for the system X version 11 release 6. |
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/usr/X386 | | Reserved for the X386 system files. |
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/usr/bin | | It contains the binaries of the commands. |
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/usr/include | | It conatins the C and C++ header files, that can further use in programming. |
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/usr/lib | | It conatins the library files. |
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/usr/local | | It contains the local installed programs by the root. |
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/usr/local/bin | It contains the binaries of local programs. |
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/usr/local/games | It contains the binaries of local games. |
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/usr/local/include | It conatins the local C and C++ header files, that can further use in programming. |
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/usr/local/lib | It contains the local shared libraries |
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/usr/local/sbin | It contains the local system binary files. |
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/usr/local/share | It is an independent hierarchy |
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/usr/local/src | It contains the local source code files. |
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/usr/sbin | | It contains the binary files that are reserved for the system administrator. |
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/usr/share | | It contains the files that are reserved for architecture's non-dependent data. |
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/usr/src | | It contains the source code files. |
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/var | | | It contains the variable data |