Research V3 development

Work on file man/man1/du.1

Synthesized-from: v3

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+.pa 1
+.he 'DU (I)'1/20/73'DU (I)'
+.ti 0
+NAME           du  --  summarize disk usage
+.sp
+.ti 0
+SYNOPSIS       du\b\b__  [ -s\b\b__ ] [ -a\b\b__ ] [ name ... ]
+.sp
+.ti 0
+DESCRIPTION    du\b\b__
+gives the number of blocks contained in all files
+and (recursively) directories within each specified directory or file name\b\b\b\b____.
+If name\b\b\b\b____ is missing, .\b_ is used.
+
+The optional argument -s\b\b__ causes only the grand total to
+be given.
+The optional argument -a\b\b__ causes an entry to be generated
+for each file.
+Absence of either causes an entry to be generated for
+each directory only.
+
+A file which has two links to it is only counted once.
+.sp
+.ti 0
+FILES          .
+.sp
+.ti 0
+SEE ALSO       --
+.sp
+.ti 0
+DIAGNOSTICS    --
+.sp
+.ti 0
+BUGS           Non-directories
+given as arguments (not under -a option) are not listed.
+.sp
+Removable
+file systems do not work correctly
+since i-numbers may be repeated while the corresponding
+files are distinct.
+Du should maintain an i-number list per root directory
+encountered.