Linux File Structure.md

• Binaries :
  • bin : store the essential user commands even before /usr is mounted for programs or app: ls, cat.
  • sbin : store administrative tools that sudo user will use : mount ,ip.
• Devices :
  • dev : every hardware devices apperars here as a file. Eg: USB-stick.
• Snap :
  • snap : where snap packages are stored.
• Root :
  • root : root-user / admin's home directory.
• Boot :
  • boot : kernel image and boot config files (bootloader lives here).
• Runs in RAM :
  • run : store information that runs on RAM & cleared after shutdown. E.g PID or socket files.
• System :
  • sys : stores kernel & hardware device information.
• Service :
  • srv : used for server-hosted data are stored.
• Temporary :
  • tmp : temporary files cleaned after reboot.
• Process :
  • proc : Contain pseudo-files that store info about Processes and resources, which gives a live-view of the kernel.
• Userland app & shared data :
  • usr : Holds most binaries, libraries, documentations for all users.
• Variable :
  • var : files which can grow in size with time. Eg : logs, cache.
• Mount :
  • media : For auto-mounted devices, like USB / DVD.
  • mnt : where we manually mount extra partitions for maintanence.
• etc :
  • etc : All the system-wide configure lives here : apt.
• Libraries :
  • lib , lib64 : Files needed by /bin&/sbin binaries.
• Optional :
  • opt : usually store manually installed software, your-own software.