Working with Linux-supported File systems
§ Controlling
Filesystem Mounting and Unmounting
1.Mounting Filesystems
In a Linux system contains entirely arbitrary data when
installing. A partition contains a
filesystem ( a way of organsning data
into files and directories in which one filesystem is made the root filesystem
(the root directory on that filesystem becomes the directory named /) and other filesystems can be mounted (the
root directory of that Filesystem
is grafted onto a directory of the root filesystem).
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The directory grafted onto is called the mount point.
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The important filesystems are mounted at boot-up; other
filesystems can be mounted or unmounted at anay time
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The mount command is used to mount a filesystem
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You usually need to have a root user (administrator)
permission to mount a filesystem.
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For example, may systemsare configured so thatit will mount
the contentof the machine’s CD-ROM drive under the directory/mnt/cdrom.
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Mount /dev/sdb3/mt/extra mounts the filesystem stored in the
/dev/sdb3 device on the mount point /mnt/extra
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You may occasionally need to specify the filesystem type
explicitly for which the syntax.
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You may occasionally need to specify the filesystem type
explicity for which the syntax is;
# mount-t vfat /dev/hdd1/mnt/windows
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Allowable filesystem types are listed in the mount (8)
manpage
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Run mount without any optios to see a list of the
filesystems currently mounted
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A filesystem can be unmounted by using the umout command
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Umount/mnt/extra unmounts whatever is on the /mnt/extra
mount point
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Umount/dev/sdb3 unmounts the filesystem in the /dev/sdb3
device, wherever it is mounted
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You normally needto have a root permission to unmount a
filesystem
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You normally need to have root permission to unmount a
filesystem
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It’s also impossible to unmount a ‘busy’ filesystem
A filesystem is
busy if a process has a file on it open
Or if a process
has a directory within it as ;its current directory
5.
Configuring mount: /etc/fstab
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The /etc/stab file contains information about filesystems
that are know to the system administrator.
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Specifying a filesystem in /etc/fstab makes it possible to
use its mount point as the only argument to mount
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/etc/fstab makes it jpossible to use its mount point as the
only argument to mount
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/etc/fstab also configures the filesystem that should be
mounted at boot-up
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Each line in /etc/fstab describes on filesystem and on each
line six columns are present.
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