Merge pull request #128 from martypenner/master

Add tldr pages for `mount` and `umount`

common/mount.md

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+# mount
+
+> Provides access to an entire filesystem in one directory.
+
+- Show all mounted filesystems
+
+`mount`
+
+- Mount a device
+
+`mount -t {{filesystem_type}} {{path_to_device_file}} {{directory_to_mount_to}}`
+
+- Mount a CD-ROM device (with the filetype ISO9660) to /cdrom (readonly)
+
+`mount -t {{iso9660}} -o ro {{/dev/cdrom}} {{/cdrom}}`
+
+- Mount all the filesystem defined in /etc/fstab
+
+`mount -a`
+
+- Mount a specific filesystem described in /etc/fstab (e.g. "/dev/sda1 /my_drive ext2 defaults 0 2")
+
+`mount {{/my_drive}}`

common/umount.md

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+# umount
+
+> Revokes access to an entire filesystem mounted to a directory.
+> A filesystem cannot be unmounted when it is busy.
+
+- Unmount a filesystem
+
+`umount {{path_to_device_file}}`
+
+- OR
+
+`umount {{path_to_mounted_directory}}`
+
+- Unmount all mounted filesystems (dangerous!)
+
+`umount -a`