/bin/df/df.1

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  29. .\" @(#)df.1 8.3 (Berkeley) 5/8/95
  30. .\" $FreeBSD$
  31. .\"
  32. .Dd March 3, 2012
  33. .Dt DF 1
  34. .Os
  35. .Sh NAME
  36. .Nm df
  37. .Nd display free disk space
  38. .Sh SYNOPSIS
  39. .Nm
  40. .Op Fl b | g | H | h | k | m | P
  41. .Op Fl acilnT
  42. .Op Fl t Ar type
  43. .Op Ar file | filesystem ...
  44. .Sh DESCRIPTION
  45. The
  46. .Nm
  47. utility
  48. displays statistics about the amount of free disk space on the specified
  49. .Ar file system
  50. or on the file system of which
  51. .Ar file
  52. is a part.
  53. Values are displayed in 512-byte per block counts.
  54. If neither a file or a file system operand is specified,
  55. statistics for all mounted file systems are displayed
  56. (subject to the
  57. .Fl t
  58. option below).
  59. .Pp
  60. The following options are available:
  61. .Bl -tag -width indent
  62. .It Fl a
  63. Show all mount points, including those that were mounted with the
  64. .Dv MNT_IGNORE
  65. flag.
  66. This is implied for file systems specified on the command line.
  67. .It Fl b
  68. Use 512-byte blocks rather than the default.
  69. Note that
  70. this overrides the
  71. .Ev BLOCKSIZE
  72. specification from the environment.
  73. .It Fl c
  74. Display a grand total.
  75. .It Fl g
  76. Use 1073741824-byte (1-Gbyte) blocks rather than the default.
  77. Note that
  78. this overrides the
  79. .Ev BLOCKSIZE
  80. specification from the environment.
  81. .It Fl H
  82. .Dq Human-readable
  83. output.
  84. Use unit suffixes: Byte, Kilobyte, Megabyte,
  85. Gigabyte, Terabyte and Petabyte in order to reduce the number of
  86. digits to four or fewer using base 10 for sizes.
  87. .It Fl h
  88. .Dq Human-readable
  89. output.
  90. Use unit suffixes: Byte, Kilobyte, Megabyte,
  91. Gigabyte, Terabyte and Petabyte in order to reduce the number of
  92. digits to four or fewer using base 2 for sizes.
  93. Inodes statistics, if enabled with
  94. .Fl i ,
  95. are always printed in base 10.
  96. .It Fl i
  97. Include statistics on the number of free inodes.
  98. .It Fl k
  99. Use 1024-byte (1-Kbyte) blocks rather than the default.
  100. Note that
  101. this overrides the
  102. .Ev BLOCKSIZE
  103. specification from the environment.
  104. .It Fl l
  105. Only display information about locally-mounted file systems.
  106. .It Fl m
  107. Use 1048576-byte (1-Mbyte) blocks rather than the default.
  108. Note that
  109. this overrides the
  110. .Ev BLOCKSIZE
  111. specification from the environment.
  112. .It Fl n
  113. Print out the previously obtained statistics from the file systems.
  114. This option should be used if it is possible that one or more
  115. file systems are in a state such that they will not be able to provide
  116. statistics without a long delay.
  117. When this option is specified,
  118. .Nm
  119. will not request new statistics from the file systems, but will respond
  120. with the possibly stale statistics that were previously obtained.
  121. .It Fl P
  122. Use POSIX compliant output of 512-byte blocks rather than the default.
  123. Note that this overrides the
  124. .Ev BLOCKSIZE
  125. specification from the environment.
  126. .It Fl t
  127. Only print out statistics for file systems of the specified types.
  128. More than one type may be specified in a comma separated list.
  129. The list of file system types can be prefixed with
  130. .Dq no
  131. to specify the file system types for which action should
  132. .Em not
  133. be taken.
  134. For example, the
  135. .Nm
  136. command:
  137. .Bd -literal -offset indent
  138. df -t nonfs,nullfs
  139. .Ed
  140. .Pp
  141. lists all file systems except those of type
  142. .Tn NFS
  143. and
  144. .Tn NULLFS .
  145. The
  146. .Xr lsvfs 1
  147. command can be used to find out the types of file systems
  148. that are available on the system.
  149. .It Fl T
  150. Include file system type.
  151. .El
  152. .Sh ENVIRONMENT
  153. .Bl -tag -width BLOCKSIZE
  154. .It Ev BLOCKSIZE
  155. If the environment variable
  156. .Ev BLOCKSIZE
  157. is set, the block counts will be displayed in units of that size block.
  158. .El
  159. .Sh SEE ALSO
  160. .Xr lsvfs 1 ,
  161. .Xr pstat 1 ,
  162. .Xr quota 1 ,
  163. .Xr swapinfo 1 ,
  164. .Xr fstatfs 2 ,
  165. .Xr getfsstat 2 ,
  166. .Xr statfs 2 ,
  167. .Xr getmntinfo 3 ,
  168. .Xr fstab 5 ,
  169. .Xr mount 8 ,
  170. .Xr quot 8
  171. .Sh HISTORY
  172. A
  173. .Nm
  174. command appeared in
  175. .At v1 .
  176. .Sh BUGS
  177. The
  178. .Fl n
  179. flag is ignored if a file or file system is specified.
  180. Also, if a mount
  181. point is not accessible by the user, it is possible that the file system
  182. information could be stale.