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==Mounting / Un-mounting Additional File-SystemsSystem Maintainance== [[Image:mount.png|thumb|700px400px|right|Using the '''mount''' command with no arguments displays file-systems that are already mounted. The Linux system administrator can use the '''mount''' and '''umount''' commands to connect and disconnect different partitions from the file-system to perform maintenance.]] '''<u>Mounting and Un-Mounting File-Systems</u>'''
We take for granted that a file-system must be mounted (for example the root partition) in order for a Linux system to be usable upon system start-up. We need to learn now to do this manually by editing or adding an entry in the ''/etc/fstab'' file. The '''/etc/fstab''' (file system table) contains entries to mount various file systems automatically upon start-up of the Linux system.
[[Image:disk_usage.png|thumb|500px300px|right|The '''df''' and '''du''' commands are useful tools for Linux system administrators to flag disk space issues and investigate their causes.]]
Another essential duty of a Linux system administrator is to anticipate problems and take preventative measures to avoid computer system problems <u>before</u> that occur.