df

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NAME
     df - display free disk space
 
SYNOPSIS
     df [-ikln] [-t type] [file | file_system ...]
 
DESCRIPTION
     df displays statistics about the amount of free disk space on the speci-
     fied file_system or on the file system of which file is a part.  Values
     are displayed in 512-byte per block block counts.  If neither a file or a
     file_system operand is specified, statistics for all mounted file systems
     are displayed (subject to the -l and -t options below).
 
     Note that the printed count of available blocks takes minfree into ac-
     count, and thus will be negative when the number of free blocks on the
     filesystem is less than minfree.
 
     The following options are available:
 
     -i      Include statistics on the number of free inodes.
 
     -k      By default, all sizes are reported in 512-byte block counts.  The
             -k option causes the numbers to be reported in kilobyte counts.
 
     -l      Display statistics only about mounted file systems with the
             MNT_LOCAL flag set.  If a non-local file system is given as an
             argument, a warning is issued and no information is given on that
             file system.
 
     -n      Print out the previously obtained statistics from the file sys-
             tems.  This option should be used if it is possible that one or
             more file systems are in a state such that they will not be able
             to provide statistics without a long delay.  When this option is
             specified, df will not request new statistics from the file sys-
             tems, but will respond with the possibly stale statistics that
             were previously obtained.
 
     -t type
             Is used to indicate the actions should only be taken on filesys-
             tems of the specified type.  More than one type may be specified
             in a comma separated list.  The list of filesystem types can be
             prefixed with ``no'' to specify the filesystem types for which
             action should not be taken.  If a file system is given on the
             command line that is not of the specified type, a warning is is-
             sued and no information is given on that file system.