TUNE2FS(8)                                             TUNE2FS(8)

NAME
       tune2fs  -  adjust tunable filesystem parameters on second
       extended filesystems

SYNOPSIS
       tune2fs [ -l ] [ -c max-mount-counts ] [ -e  errors-behav-
       ior ] [ -i interval-between-checks ] [ -m reserved-blocks-
       percentage ] [ -r reserved-blocks-count  ]  [  -s  sparse-
       super-flag ] [ -u user ] [ -g group ] [ -C mount-count ] [
       -L volume-name ] [ -M last-mounted-directory ] [ -U UUID ]
       device

DESCRIPTION
       tune2fs  adjusts  tunable filesystem parameters on a Linux
       second extended filesystem.

       Never use tune2fs to change  parameters  of  a  read/write
       mounted filesystem!

OPTIONS
       -c max-mount-counts
              adjust   the   maximal  mounts  count  between  two
              filesystem checks.

       -e error-behavior
              change the behavior of the kernel code when  errors
              are  detected.   error-behavior  can  be one of the
              following:
                   continue       Continue normal execution.
                   remount-ro     Remount  the  filesystem  read-
              only.
                   panic          Cause a kernel panic.

       -g group
              set  the  user  group  which  can  benefit from the
              reserved blocks.
              group can be a numerical gid or a group name.

       -i interval-between-checks[d|m|w]
              adjust the  maximal  time  between  two  filesystem
              checks.   No  postfix or `d' result in days, `m' in
              months, and `w' in weeks.  A  value  of  zero  will
              disable the timedependent checking.

       -l     list the contents of the filesystem superblock.

       -m reserved-blocks-percentage
              adjust  the reserved blocks percentage on the given
              device.

       -r reserved-blocks-count
              adjust the  reserved  blocks  count  on  the  given
              device.

       -s sparse_super_flag
              set  or  reset  the  sparse_superblock  flag.   The
              sparse_superblock feature saves space on really big
              filesystems.   Warning:  The  Linux 2.0 kernel does
              not properly support this feature.  Neither do  all
              Linux 2.1 kernels; please don't use this unless you
              know what you're doing!

       -u user
              set the user who  can  benefit  from  the  reserved
              blocks.   user  can  be  a  numerical uid or a user
              name.

       -C mount-count
              set the number of times  the  filesystem  has  been
              mounted.

       -L volume-label
              set  the  volume  label  of  the  filesystem.  Ext2
              filesystem labels can  be  at  most  16  characters
              long; if volume-label is longer than 16 characters,
              tune2fs will truncate it and print a  warning  mes-
              sage.

       -M last-mounted-directory
              set  the last-mounted directory for the filesystem.

       -U UUID
              set the UUID of  the  filesystem.   A  sample  UUID
              looks                   like                  this:
              "c1b9d5a2-f162-11cf-9ece-0020afc76f16".   The  uuid
              may  also  be "null", which will set the filesystem
              UUID to the null UUID.  The uuid may also be  "ran-
              dom", which will generate a new random UUID for the
              filesystem.

BUGS
       We haven't found any bugs yet. Perhaps there are bugs  but
       it's unlikely.

WARNING
       Use  this  utility  at  your  own risk. You're modifying a
       filesystem!

AUTHOR
       tune2fs was written by Remy Card  <card@masi.ibp.fr>,  the
       developer and maintainer of the ext2 fs.
       tune2fs  uses  the ext2fs library written by Theodore Ts'o
       <tytso@mit.edu>.
       This manual page was written by Christian Kuhtz <chk@data-
       hh.Hanse.DE>.
       Timedependent    checking    was   added   by   Uwe   Ohse
       <uwe@tirka.gun.de>.

AVAILABILITY
       tune2fs is part of the e2fsprogs package and is  available
       for  anonymous ftp from tsx-11.mit.edu in /pub/linux/pack-
       ages/ext2fs.

SEE ALSO
       dumpe2fs(8), e2fsck(8), mke2fs(8)

E2fsprogs version 1.14     January 1999                         1