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
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.
Forces quotacheck to make backups of the quota file before
writing the new data.
-v, --verbosequotacheck 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).
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.
Only user quotas listed in /etc/mtab or on the filesystems
specified are to be checked. This is the default action.
Only group quotas listed in /etc/mtab or on the filesystems
specified are to be checked.
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.
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.
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.
Don't try to remount filesystem read-only. See comment with
Interactive mode. By default quotacheck exits when it finds an
error. In interactive mode user is asked for input instead.
See option -n.
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).
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)
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.
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
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 email@example.com] It is not known how to
report bugs for this man page; if you know, please send a mail to
firstname.lastname@example.org. This page was obtained from the project's
upstream Git repository
2016-12-10. If you discover any rendering problems in this HTML ver‐
sion of the page, or you believe there is a better or more up-to-date
source for the page, or you have corrections or improvements to the
information in this COLOPHON (which is not part of the original man‐
ual page), send a mail to email@example.com
Fri Jul 20 2001 quotacheck(8)