System Administration Guide, Volume 1

File System Administration Commands

Most file system administration commands have both a generic and a file system-specific component. You should use the generic commands whenever possible, which call the file system-specific component. The table below lists the generic file system administrative commands, which are located in the /usr/sbin directory.

Table 34-1 Generic File System Administrative Commands




Clears inodes 


Reports the number of free disk blocks and files 


Lists file names and statistics for a file system 


Checks the integrity of a file system and repairs any damage found 


Debugs the file system 


Determines the file system type 


Lists or provides labels for file systems when copied to tape (for use by the volcopy command only)


Makes a new file system 


Mounts local and remote file systems 


Mounts all file systems specified in the virtual file system table (/etc/vfstab)


Generates a list of path names with their i-numbers 


Unmounts local and remote file systems 


Unmounts all file systems specified in a virtual file system table (/etc/vfstab)


Makes an image copy of a file system 

How the File System Commands Determine the File System Type

The generic file system commands determine the file system type by following this sequence:

  1. From the -F option, if supplied.

  2. By matching a special device with an entry in /etc/vfstab file (if special is supplied). For example, fsck first looks for a match against the fsck device field; if no match is found, it then checks the special device field.

  3. By using the default specified in /etc/default/fs for local file systems and in /etc/dfs/fstypes for remote file systems.

Manual Pages for Generic and Specific Commands

Both the generic and specific commands have manual pages in the man Pages(1M): System Administration Commands. The specific manual page is a continuation of the generic manual page. To look at a specific manual page, append an underscore and the file system type abbreviation to the generic command name. For example, to see the specific manual page for mounting a UFS file system, type man mount_ufs.