quotacheck – Scan a file system for disk usage – scan filesystem, verifyes & updates quota info


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 ommitted 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     Forces quotacheck to make backups of the quota file before writ-
              ing the new data.

       -v     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     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     Only user quotas listed in /etc/mtab or on the filesystems spec-
              ified are to be checked.  This is the default action.
              write to a filesystem while scanning.

       -m     Don't  try  to  remount  filesystem  read-only. See comment with
              option -M.

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

       -n     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-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  (version  1  quota),  vfsv0 (version 2 quota), rpc
              (quota over NFS), xfs (quota on XFS filesystem)

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

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