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           btrfs subvolume snapshot <source> [<dest>/]<name>
           btrfs subvolume delete <subvolume>
           btrfs subvolume create [<dest>/]<name>
           btrfs subvolume list <path>
           btrfs subvolume set-default <id> <path>
           btrfs filesystem defrag <file>|<dir> [<file>|<dir>...]
           btrfs filesystem sync <path>
           btrfs filesystem resize [+/-]<size>[gkm]|max <filesystem>
           btrfs device scan [<device> [<device>..]]
           btrfs device show <dev>|<label> [<dev>|<label>...]
           btrfs device balance <path>
           btrfs device add <dev> [<dev>..] <path>
           btrfs device delete <dev> [<dev>..] <path> ]
           btrfs help|--help|-h


           btrfs  is  used to control the filesystem and the files and directories
           stored. It is the tool to create or destroy a snapshot or  a  subvolume
           for  the filesystem, to defrag a file or a directory, flush the data to
           the disk, to resize the filesystem, to scan the device.
           It is possible to abbreviate the  commands  unless  the  commands   are
           ambiguous.   For example: it is possible to run btrfs sub snaps instead
           of btrfs subvolume snapshot.  But btrfs dev s is not  allowed,  because
           dev  s  may  be interpreted both as device show and as device scan.  In
           this case btrfs returns an error.
           If a command is terminated by --help , the relevant help is showed.  If
           the  passed  command matches more commands, the help of all the matched
           commands are showed. For example btrfs dev --help shows the help of all
           device* command.


           subvolume snapshot <source> [<dest>/]<name>
                  Create  a  writable  snapshot of the subvolume <source> with the
           subvolume list <path>
                  List  the subvolumes present in the filesystem <path>. For every
                  subvolume is showed the subvolume ID (second column), the ID  of
                  the  top  level  subvolume (fifth column), and the path (seventh
                  column) relative to the top level subvolume.  These <ID> may  be
                  used  by the subvolume set-default command, or at mount time via
                  the subvol= option.
           subvolume set-default <id> <path>
                  Set the subvolume of the filesystem <path> which is  mounted  as
                  default.  The subvolume is identified by <id>, which is returned
                  by the subvolume list command.
           filesystem defragment <file>|<dir> [<file>|<dir>...]
                  Defragment files and/or directories.
           device scan [<device> [<device>..]]
                  Scan devices for a btrfs filesystem. If no devices  are  passed,
                  btrfs scans all the block devices.
           filesystem sync <path>
                  Force a sync for the filesystem identified by <path>.
           filesystem resize [+/-]<size>[gkm]|max <path>
                  Resize  a filesystem identified by <path>.  The <size> parameter
                  specifies the new size of the filesystem.  If the prefix + or  -
                  is  present  the  size is increased or decreased by the quantity
                  <size>.  If no units are  specified,  the  unit  of  the  <size>
                  parameter  defaults to bytes. Optionally, the size parameter may
                  be suffixed by one of the following the units designators:  'K',
                  'M', or 'G', kilobytes, megabytes, or gigabytes, respectively.
                  If  'max'  is  passed,  the filesystem will occupy all available
                  space on the volume(s).
                  The resize command does not manipulate the  size  of  underlying
                  partition.  If you wish to enlarge/reduce a filesystem, you must
                  make sure you can expand  the  partition  before  enlarging  the
                  filesystem  and  shrink the partition after reducing the size of
                  the filesystem.
           filesystem show [<uuid>|<label>]
                  Show the btrfs filesystem with some additional info. If no  UUID
                  or label is passed, btrfs show info of all the btrfs filesystem.


           btrfs  returns a zero exist status if it succeeds. Non zero is returned
           in case of failure.


           btrfs is part of btrfs-progs. Btrfs filesystem is currently under heavy
           development,  and not suitable for any uses other than benchmarking and
           review.  Please refer to the  btrfs  wiki
           for further details.



    btrfs BTRFS(8)


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