linux - df (1)

       df - summarize free disk space

       df  [-aikPv]  [-t  fstype]  [-x fstype] [--all] [--inodes]
       [--type=fstype]   [--exclude-type=fstype]    [--kilobytes]
       [--portability] [--print-type] [--help] [--version] [file-

       This manual page documents the GNU version of df.  df dis-
       plays the amount of disk space available on the filesystem
       containing each file name argument.  If no  file  name  is
       given,  the  space  available  on  all  currently  mounted
       filesystems is shown.  Disk space is shown in 1K blocks by
       default,  unless  the environment variable POSIXLY_CORRECT
       is set, in which case 512-byte blocks are used.

       If an argument is the absolute file name of a disk  device
       node  containing  a mounted filesystem, df shows the space
       available on that filesystem rather than on the filesystem
       containing  the  device  node  (which  is  always the root
       filesystem).  This version of df  cannot  show  the  space
       available  on unmounted filesystems, because on most kinds
       of systems doing so  requires  very  nonportable  intimate
       knowledge of filesystem structures.

       -a, --all
              Include  in  the  listing  filesystems  that have 0
              blocks,  which  are  omitted  by   default.    Such
              filesystems  are  typically special-purpose pseudo-
              filesystems, such as automounter entries.  On  some
              systems, filesystems of type ``ignore'' or ``auto''
              are also omitted by default  and  included  in  the
              listing by this option.

       -i, --inodes
              List  inode  usage  information  instead  of  block
              usage.  An inode (short for ``index  node'')  is  a
              special  kind  of disk block that contains informa-
              tion about a file, such as its owner,  permissions,
              timestamps, and location on the disk.

       -k, --kilobytes
              Print  sizes  in  1K  blocks  instead  of  512-byte
              blocks.  This overrides  the  environment  variable

       -P, --portability
              Use  the  POSIX  output  format.   This is like the
              default format except that  the  information  about
              itself.   This  means that if the mount device name
              is more than 20 characters long (as for  some  net-
              work mounts), the columns are misaligned.

       -T, --print-type
              Print  a type string for each filesystem.  Any such
              printed filesystem type name  may  be  used  as  an
              argument    to    either    of   the   --type=   or
              --exclude-type= options.

       -t, --type=fstype
              Limit the listing to filesystems  of  type  fstype.
              Multiple  filesystem  types  can be shown by giving
              multiple -t options.  By  default,  all  filesystem
              types are listed.

       -x, --exclude-type=fstype
              Limit  the  listing  to  filesystems  not  of  type
              fstype.  Multiple filesystem types  can  be  elimi-
              nated  by  giving multiple -x options.  By default,
              all filesystem types are listed.

       -v     Ignored; for compatibility with System  V  versions
              of df.

       --help Print  a  usage message on standard output and exit

              Print version information on standard  output  then
              exit successfully.