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  11 .TH DU 1 "Feb 6, 2007"
  12 .SH NAME
  13 du \- summarize disk usage
  14 .SH SYNOPSIS
  15 .LP
  16 .nf
  17 \fB/usr/bin/du\fR [\fB-dorx\fR] [\fB-a\fR | \fB-s\fR] [\fB-h\fR | \fB-k\fR | \fB-m\fR] [\fB-H\fR | \fB-L\fR]
  18      [\fIfile\fR ...]
  19 .fi
  20 
  21 .LP
  22 .nf
  23 \fB/usr/xpg4/bin/du\fR [\fB-dorx\fR] [\fB-a\fR | \fB-s\fR] [\fB-h\fR | \fB-k\fR | \fB-m\fR] [\fB-H\fR | \fB-L\fR]
  24      [\fIfile\fR ...]
  25 .fi
  26 
  27 .SH DESCRIPTION
  28 .sp
  29 .LP
  30 The \fBdu\fR utility writes to standard output the size of the file space
  31 allocated to, and the size of the file space allocated to each subdirectory of,
  32 the file hierarchy rooted in each of the specified files. The size of the file
  33 space allocated to a file of type directory is defined as the sum total of
  34 space allocated to all files in the file hierarchy rooted in the directory plus
  35 the space allocated to the directory itself. This sum will include the space
  36 allocated to any extended attributes encountered.
  37 .sp
  38 .LP
  39 Files with multiple links will be counted and written for only one entry. The
  40 directory entry that is selected in the report is unspecified. By default, file
  41 sizes are written in 512-byte units, rounded up to the next 512-byte unit.
  42 .SS "/usr/xpg4/bin/du"
  43 .sp
  44 .LP
  45 When \fBdu\fR cannot obtain file attributes or read directories (see
  46 \fBstat\fR(2)), it will report an error condition and the final exit status
  47 will be affected.
  48 .SH OPTIONS
  49 .sp
  50 .LP
  51 The following options are supported for \fB/usr/bin/du\fR and
  52 \fB/usr/xpg4/bin/du\fR:
  53 .sp
  54 .ne 2
  55 .na
  56 \fB\fB-a\fR\fR
  57 .ad
  58 .RS 6n
  59 In addition to the default output, report the size of each file not of type
  60 directory in the file hierarchy rooted in the specified file. Regardless of the
  61 presence of the \fB-a\fR option, non-directories given as \fIfile\fR operands
  62 will always be listed.
  63 .RE
  64 
  65 .sp
  66 .ne 2
  67 .na
  68 \fB\fB-d\fR\fR
  69 .ad
  70 .RS 6n
  71 Do not cross filesystem boundaries. For example, the command, \fBdu -d /\fR
  72 reports usage only on the root partition.
  73 .RE
  74 
  75 .sp
  76 .ne 2
  77 .na
  78 \fB\fB-h\fR\fR
  79 .ad
  80 .RS 6n
  81 All sizes are scaled to a human readable format, for example, \fB14K\fR,
  82 \fB234M\fR, \fB2.7G\fR, or \fB3.0T\fR. Scaling is done by repetitively dividing
  83 by \fB1024\fR.
  84 .RE
  85 
  86 .sp
  87 .ne 2
  88 .na
  89 \fB\fB-H\fR\fR
  90 .ad
  91 .RS 6n
  92 If a symbolic link to a directory is specified on the command line, process the
  93 symbolic link by using the directory which the symbolic link references, rather
  94 than the link itself.
  95 .RE
  96 
  97 .sp
  98 .ne 2
  99 .na
 100 \fB\fB-k\fR\fR
 101 .ad
 102 .RS 6n
 103 Write the files sizes in units of 1024 bytes, rather than the default 512-byte
 104 units.
 105 .RE
 106 
 107 .sp
 108 .ne 2
 109 .na
 110 \fB\fB-L\fR\fR
 111 .ad
 112 .RS 6n
 113 Process symbolic links by using the file or directory which the symbolic link
 114 references, rather than the link itself.
 115 .RE
 116 
 117 .sp
 118 .ne 2
 119 .na
 120 \fB\fB-m\fR\fR
 121 .ad
 122 .RS 6n
 123 Write the files sizes in units of megabytes, rather than the default 512-byte
 124 units.
 125 .RE
 126 
 127 .sp
 128 .ne 2
 129 .na
 130 \fB\fB-o\fR\fR
 131 .ad
 132 .RS 6n
 133 Do not add child directories' usage to a parent's total. Without this option,
 134 the usage listed for a particular directory is the space taken by the files in
 135 that directory, as well as the files in all directories beneath it. This option
 136 does nothing if \fB-s\fR is used.
 137 .RE
 138 
 139 .sp
 140 .ne 2
 141 .na
 142 \fB\fB-r\fR\fR
 143 .ad
 144 .RS 6n
 145 Generate diagnostic messages about unreadable directories and files whose
 146 status cannot be obtained. /usr/bin/du is silent if these conditions arise and
 147 \fB-r\fR is not specified. \fB/usr/xpg4/bin/du\fR acts as though \fB-r\fR is
 148 always specified.
 149 .RE
 150 
 151 .sp
 152 .ne 2
 153 .na
 154 \fB\fB-s\fR\fR
 155 .ad
 156 .RS 6n
 157 Instead of the default output, report only the total sum for each of the
 158 specified files.
 159 .RE
 160 
 161 .sp
 162 .ne 2
 163 .na
 164 \fB\fB-x\fR\fR
 165 .ad
 166 .RS 6n
 167 When evaluating file sizes, evaluate only those files that have the same device
 168 as the file specified by the file operand.
 169 .RE
 170 
 171 .sp
 172 .LP
 173 Specifying more than one of the options in the mutually exclusive pair,
 174 \fB-H\fR and \fB-L\fR, is not considered an error. The last option specified
 175 determines the output format.
 176 .sp
 177 .LP
 178 Specifying more than one of the options in the mutually exclusive set of
 179 options \fB-h\fR, \fB-k\fR, and \fB-m\fR is not considered an error.  The last
 180 option specified determines the output format.
 181 .SH OPERANDS
 182 .sp
 183 .LP
 184 The following operand is supported:
 185 .sp
 186 .ne 2
 187 .na
 188 \fB\fIfile\fR\fR
 189 .ad
 190 .RS 8n
 191 The path name of a file whose size is to be written. If no \fIfile\fR is
 192 specified, the current directory is used.
 193 .RE
 194 
 195 .SH OUTPUT
 196 .sp
 197 .LP
 198 The output from \fBdu\fR consists of the amount of the space allocated to a
 199 file and the name of the file.
 200 .SH USAGE
 201 .sp
 202 .LP
 203 See \fBlargefile\fR(5) for the description of the behavior of \fBdu\fR when
 204 encountering files greater than or equal to 2 Gbyte ( 2^31 bytes).
 205 .SH ENVIRONMENT VARIABLES
 206 .sp
 207 .LP
 208 See \fBenviron\fR(5) for descriptions of the following environment variables
 209 that affect the execution of \fBdu\fR: \fBLANG\fR, \fBLC_ALL\fR,
 210 \fBLC_CTYPE\fR, \fBLC_MESSAGES\fR, and \fBNLSPATH\fR.
 211 .SH EXIT STATUS
 212 .sp
 213 .LP
 214 The following exit values are returned:
 215 .sp
 216 .ne 2
 217 .na
 218 \fB\fB0\fR\fR
 219 .ad
 220 .RS 6n
 221 Successful completion.
 222 .RE
 223 
 224 .sp
 225 .ne 2
 226 .na
 227 \fB\fB>0\fR\fI\fR\fR
 228 .ad
 229 .RS 6n
 230 An error occurred.
 231 .RE
 232 
 233 .SH ATTRIBUTES
 234 .sp
 235 .LP
 236 See \fBattributes\fR(5) for descriptions of the following attributes:
 237 .SS "/usr/bin/du"
 238 .sp
 239 
 240 .sp
 241 .TS
 242 box;
 243 c | c
 244 l | l .
 245 ATTRIBUTE TYPE  ATTRIBUTE VALUE
 246 _
 247 CSI     Enabled
 248 _
 249 Interface Stability     Stable
 250 .TE
 251 
 252 .SS "/usr/xpg4/bin/du"
 253 .sp
 254 
 255 .sp
 256 .TS
 257 box;
 258 c | c
 259 l | l .
 260 ATTRIBUTE TYPE  ATTRIBUTE VALUE
 261 _
 262 CSI     Enabled
 263 _
 264 Interface Stability     Standard
 265 .TE
 266 
 267 .SH SEE ALSO
 268 .sp
 269 .LP
 270 \fBls\fR(1), \fBstat\fR(2), \fBattributes\fR(5), \fBenviron\fR(5),
 271 \fBfsattr\fR(5), \fBlargefile\fR(5), \fBstandards\fR(5)
 272 .sp
 273 .LP
 274 \fISystem Administration Guide: Basic Administration\fR
 275 .SH NOTES
 276 .sp
 277 .LP
 278 A file with two or more links is counted only once. If, however, there are
 279 links between files in different directories where the directories are on
 280 separate branches of the file system hierarchy, \fBdu\fR will count the excess
 281 files more than once.
 282 .sp
 283 .LP
 284 Files containing holes will result in an incorrect block count.