| Term | Definition |
| / | files necessary to obtain/repair a system ("root"). |
| /bin | binaries for single user mode, for all users. |
| /boot | files necessary to boot a system. |
| /dev | devices. |
| /etc | system-wide configuration files. |
| /home | users' home dirs (not "your home directory"!). |
| /lib | libraries for binaries. |
| /mnt | other mounted filesystems. |
| /media | temporarily mounted media. |
| /opt | additionally installed software. |
| /proc | process and kernel stati. |
| /root | home directory for user root. |
| /sbin | system binaries (for root mainly). |
| /srv | files provided by services running on the host. |
| /tmp | temporary files. |
| /usr | secondary hierarchy for user data. |
| /usr/local | tertiary hierarchy for user data. |
| /var | variable files. |