Man Linux: Main Page and Category List


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


       Jan Kara <>
       Based on old quotacheck by:
       Edvard Tuinder <>
       Marco van Wieringen <>

                                Fri Jul 20 2001                  quotacheck(8)