quotacheck - scan a filesystem for disk usage, create, check and repair
   quota files


   quotacheck [ -gubcfinvdMmR ] [ -F quota-format ] -a | filesystem


   quotacheck examines each filesystem, builds a  table  of  current  disk
   usage,  and compares this table against that recorded in the disk quota
   file for  the  filesystem  (this  step  is  omitted  if  option  -c  is
   specified).  If  any  inconsistencies are detected, both the quota file
   and the current system copy of the incorrect quotas  are  updated  (the
   latter  only  occurs  if  an  active filesystem is checked which is not
   advised).  By  default,  only  user  quotas  are  checked.   quotacheck
   expects  each  filesystem  to  be  checked  to  have  quota files named
   [a]quota.user and [a]quota.group located at the root of the  associated
   filesystem.  If a file is not present, quotacheck will create it.

   If  the  quota file is corrupted, quotacheck tries to save as much data
   as possible.   Rescuing  data  may  need  user  intervention.  With  no
   additional  options  quotacheck  will  simply exit in such a situation.
   When in interactive mode (option -i) , the user is  asked  for  advice.
   Advice  can  also be provided from command line (see option -n) , which
   is useful when quotacheck is run automatically (ie.  from  script)  and
   failure is unacceptable.

   quotacheck  should  be  run  each time the system boots and mounts non-
   valid filesystems.  This is most likely to happen after a system crash.

   It is strongly recommended to run quotacheck with quotas turned off for
   the filesystem. Otherwise, possible damage or loss to data in the quota
   files can result.  It is also  unwise  to  run  quotacheck  on  a  live
   filesystem  as  actual  usage  may  change during the scan.  To prevent
   this, quotacheck tries  to  remount  the  filesystem  read-only  before
   starting  the  scan.  After the scan is done it remounts the filesystem
   read-write. You can disable this with option -m.   You  can  also  make
   quotacheck  ignore the failure to remount the filesystem read-only with
   option -M.


   -b, --backup
          Forces quotacheck to make  backups  of  the  quota  file  before
          writing the new data.

   -v, --verbose
          quotacheck  reports its operation as it progresses.  Normally it
          operates silently.  If the option is specified twice,  also  the
          current  directory  is printed (note that printing can slow down
          the scan measurably).

   -d, --debug
          Enable debugging mode.  It will result in a lot  of  information
          which  can  be used in debugging the program. The output is very
          verbose and the scan will be slow.

   -u, --user
          Only user quotas listed  in  /etc/mtab  or  on  the  filesystems
          specified are to be checked.  This is the default action.

   -g, --group
          Only  group  quotas  listed  in  /etc/mtab or on the filesystems
          specified are to be checked.

   -c, --create-files
          Don't read existing quota files. Just perform  a  new  scan  and
          save  it  to  disk.  quotacheck also skips scanning of old quota
          files when they are not found.

   -f, --force
          Forces checking and writing of new quota  files  on  filesystems
          with  quotas  enabled.  This  is  not recommended as the created
          quota files may be out of sync.

   -M, --try-remount
          This flag forces checking of filesystem in read-write mode if  a
          remount  fails.  Do  this only when you are sure no process will
          write to a filesystem while scanning.

   -m, --no-remount
          Don't try to remount  filesystem  read-only.  See  comment  with
          option -M.

   -i, --interactive
          Interactive  mode.  By default quotacheck exits when it finds an
          error. In interactive mode user is asked for input instead.  See
          option -n.

   -n, --use-first-dquot
          If  the  quota  files  become  corrupted,  it  is  possible  for
          duplicate entries for a  single  user  or  group  ID  to  exist.
          Normally  in this case, quotacheck exits or asks user for input.
          When this option is set, the first entry found  is  always  used
          (this option works in interactive mode too).

   -F, --format=format-name
          Check and fix quota files of specified format (ie. don't perform
          format auto-detection). This is recommended as  detection  might
          not  work  well on corrupted quota files.  Possible format names
          are: vfsold Original quota format with 16-bit UIDs / GIDs, vfsv0
          Quota format with 32-bit UIDs / GIDs, 64-bit space usage, 32-bit
          inode usage and limits, vfsv1 Quota  format  with  64-bit  quota
          limits  and  usage,  rpc  (quota  over  NFS),  xfs (quota on XFS

   -a, --all
          Check all mounted non-NFS filesystems in /etc/mtab

   -R, --exclude-root
          When used together with the -a option,  all  filesystems  except
          for the root filesystem are checked for quotas.


   quotacheck  should  only be run by super-user. Non-privileged users are
   presumably not allowed  to  read  all  the  directories  on  the  given


   quota(1),     quotactl(2),     fstab(5),    quotaon(8),    repquota(8),
   convertquota(8), setquota(8), edquota(8), fsck(8), efsck(8), e2fsck(8),


   aquota.user or aquota.group
                  located at filesystem root with quotas (version 2 quota,
                  non-XFS filesystems)
   quota.user or quota.group
                  located at filesystem root with quotas (version 1 quota,
                  non-XFS filesystems)
   /etc/mtab      names and locations of mounted filesystems


   Jan Kara <jack@suse.cz>
   Based on old quotacheck by:
   Edvard Tuinder <ed@elm.net>
   Marco van Wieringen <mvw@planets.elm.net>

                            Fri Jul 20 2001                  quotacheck(8)


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