quotacheck(8)              System Manager's Manual             quotacheck(8)

NAME         top

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

SYNOPSIS         top

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

DESCRIPTION         top

       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

       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.

OPTIONS         top

       -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 filesystem)

       -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.

NOTE         top

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

SEE ALSO         top

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

FILES         top

       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

AUTHOR         top

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

COLOPHON         top

       This page is part of the quota (Linux Diskquota Tools) project.
       Information about the project can be found at [unknown -- if you
       know, please contact] It is not known how to
       report bugs for this man page; if you know, please send a mail to  This page was obtained from the project's
       upstream Git repository 
       ⟨git://⟩ on
       2016-10-04.  If you discover any rendering problems in this HTML ver‐
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       ual page), send a mail to

                               Fri Jul 20 2001                 quotacheck(8)