df Command
  
  
  Purpose
  
  Reports information about space on file systems.
  
   Syntax
  
  df [  -I |  -M |  -i |  -s |  -v ] [  FileSystem ...  |
  File ... ]
  
  Description
  
  The df command displays information about total space and avail-
  able space on a file system.  The FileSystem parameter specifies
  the  name  of  the device on which the file system  resides,  the
  directory on which the  file  system  is mounted, or the relative
  path name of a file system.  If you do not specify the FileSystem
  parameter, the df command displays information for all currently
  mounted file systems.  If a file or directory is specified,  then
  the df command displays information for the file system on which
  the file resides.
  
  Normally, the df command uses free counts contained in the super-
  block.  Under certain exceptional conditions, these counts may be
  in error.  For example, if a file  system is being actively modi-
  fied when the df command is performing, the free count may not be
  accurate.
  
  Note:	On some remote file systems, such as network file systems
  (NFS), columns are blank if the  server  does not provide the in-
  formation.
  
  Flags
  
  -i	Displays the number of free and used i-nodes for the file sys-
  tem; this is the default when the specified file system is mount-
  ed.
  
  -I	Displays information on total KB, used space, free space, per-
  centage of used space, and mount point for the file system.
  
  -M	Displays the mount point information for the file system in
  the second column.
  
  -s	Makes a full search of the free block list.
  
  Note:	The df command requires considerably more processing time
  when the -s flag is specified.
  
  -v	Displays all information for the specified file system.
  
  Exit Status
  
  This command returns the following exit values:
  
  0	Successful completion.
  
  >0	An error occurred.
  
  Examples
  
  1.	To display information about all mounted file systems, enter:
  
  df
  
  If your system is configured so that the /, /usr, /site, and
  /usr/venus directories reside in separate file systems, the out-
  put from the df command resembles the following:
  
  Device   Total KB   free   %used   iused   %iused  Mounted on
  /dev/hd0    19368    9976    48%     4714    5%     /
  /dev/hd1    24212    4808    80%     5031   19%     /usr
  /dev/hd2     9744    9352     4%     1900    4%     /site
  /dev/hd3     3868    3856     0%      986    0%     /usr/venus 
  
  2.	To display available space on the file system in which your
  current directory resides, enter:
  
  df 
  
  Implementation Specifics
  
  This command is part of Base Operating System (BOS) Runtime.
  
  Files
  
  /etc/filesystems	Lists the known file systems and defines their
  characteristics.
  
  /etc/vfs	Contains descriptions of virtual file system types.
  
  Related Information
  
  The  fsck command.
  
  The  filesystems file.
  
  The  File Systems Overview for System Management in AIX Version
  3.2 System Management Guide: Operating System and Devices ex-
  plains file system types, management, structure, and maintenance.
  
  The  Mounting Overview in AIX Version 3.2 System Management
  Guide: Operating System and Devices explains mounting files and
  directories, mount points, and automatic mounts.