/lib Shared libraries, kernel modules/lost+foundRecovered files (if found after a file system check)/media Mount point for removable media, such as DVDs and floppy
disks/mnt Usual mount point for local, remote file systems, file
systems that are additional to the standard, such as a DVD-
ROM or another HDD/opt Add-on software packages/proc Kernel information, process control/root Super user (root) home/sbin System commands (mostly root only)/srv Information relating to services that run on the system/sys Real-time information on devices used by the kernel/tmp Temporary files/usr Software not essential for system operation, such as
applicationsKnowing these directories can help you find files when you need them. This
knowledge can even help you partition hard drives when you install new
systems; you can choose to put certain directories on their own distinct
partition, which can be useful for things like isolating directories from one
another (for example, for server security you might put a directory like
/boot that doesn’t change often on its own partition and make it read-only
and unchangeable without specific operations being done by a super user
during a maintenance cycle). Desktop users probably don’t need to think
about such operations, but knowing the directory tree is still quite useful when
you want to find the configuration file for a specific program and set some
program options system-wide to affect all users.
NOTE