quotacheck examines each mounted ufs file system,
builds a table of current disk usage, and compares this table against the information stored in the file system's disk quota file. If any inconsistencies are detected, both the quota file and the current system copy of the incorrect quotas are updated.
filesystem is either a file system mount point or the block device on which the file system resides.
quotacheck expects each file system to be checked to have a quota file named quotas in the root directory. If none is present, quotacheck will not check the file system.
quotacheck accesses the character special device in calculating the actual disk usage for each user. Thus, the file systems that are checked should be quiescent while quotacheck is running.