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       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  speci-
       fied). 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  addi-
       tional 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

       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 writ-
              ing 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.

       -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 dupli-
              cate 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),  con-
       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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