Linux File System is organized in directories, each directory serves a purpose, here you can find a short but precise description for the most usefull directories:
Check this post to get the path where you are located in Linux.
/ | The root directory, all directories start from this directory. |
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/bin | Has programs essential for the system. |
/boot | Has the Linux kernel, files needed for the boot sequence and boot configuration files. |
/dev | Everything in Linux is a file, a device recognized by the system is represented by a file. |
/etc | Has system wide configuration files, some of the most important are: crontab: scheduled tasks fstab: mount points * passwd: users |
/home | Has directories for each user, a good practice is to keep this directory on a seperate partition. |
/lib | Shared libraries for the programs. |
/lost+found | It keeps filesystem recovered files, normally is empty. |
/media | Mount points for removable media like usb. |
/mnt | For things you mount manually or with fstab. |
/opt | Usually is used to install optionall software. |
/proc | Its a virtual file system which keeps files for running processes. |
/root | The home directory for the root user. |
/sbin | Programs that used from the root user. |
/tmp | Used to keep temporary files used by the processes, its emptied after a reboot. |
/usr | Contains programs/files used by regular users. |
/usr/bin | Contains programs installed by the Linux installer. |
/usr/lib | Shared libraries for programs in /usr/bin. |
/usr/local | Programs that are not installed by the Linux installer, but are used for system wide usage. |
/usr/sbin | Programs executed with sudo or root user, usually system administration things. |
/usr/share | Files shared by programs in /usr/bin. |
/usr/share/doc | Documentation files of programs in /usr/bin. |
/var | Holds files that usually changes over time, like databases files. |
/var/log | Logs of various programs. |
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