02/28/85 sweep

Syntax as a command:  sweep {path} {-control_args}


Function:  obtains the disk usage figures for the hierarchy, or any
specified subtree, and places them in a segment for subsequent use by
accounting and disk usage analysis tools.  By default, the segment is
named disk_stat.  It is not an ASCII segment, and the disk_stat_print
command must be used to print its contents.


Arguments:
path
   is the pathname of the directory at which the sweep is to start.
   The usage figures for this directory, and for the entire subtree
   beneath it are recorded.  If path is omitted, the sweep begins at
   the root directory.  See "Notes" below.


Control arguments:
-brief, -bf
   does not print an error message when unable to force access to a
   directory to read its usage figures.  This is the default.
-long, -lg
   prints an error message if unable to force access to a directory.
-output_file XX, -of XX
   places the output in the specified segment XX rather than in the
   default segment, named disk_stat, in the working directory.


-pdd
   do not exlude >pdd from the sweep.  By default, a sweep that starts
   at the root deliberately omits >pdd.  This argument is not used in
   the accounting application of this program, but it may be used
   during an analysis of disk space usage, when complete and accurate
   total page usage figures are desired.  The initializer process must
   first be used to give sma access to >pdd to the process that will
   run the sweep.


Notes:  The figures recorded in disk_stat are the quota, records used,
and time-record product (trp).  These figures are recorded separately
for segment pages and directory pages.

Since directories with zero quotas have their record usage and trp
figures included in those of the first superior directory with nonzero
quota, it is not necessary for sweep to walk the entire hierarchy.
Instead, whenever it encounters a directory with a zero quota, it goes
no further down in that particular branch, but instead goes on to the
next directory at the same level.  This applies separately to segment
and directory quotas.


Therefore, any directory whose usage figures are to be recorded
separately for purposes of accounting or disk usage analysis must be
given nonzero segment and directory quotas.  It is recommended that at
least all directories immediately inferior to the root and all project
directories under >udd be given nonzero segment and directory quotas.

Project administrators may use this command to obtain detailed
information about the disk usage of a project's users by executing
sweep with the project directory pathname as the first argument.  This
is possible, however, only if the users' home directories have nonzero
quotas.


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Historical Background

This edition of the Multics software materials and documentation is provided and donated
to Massachusetts Institute of Technology by Group BULL including BULL HN Information Systems Inc. 
as a contribution to computer science knowledge.  
This donation is made also to give evidence of the common contributions of Massachusetts Institute of Technology,
Bell Laboratories, General Electric, Honeywell Information Systems Inc., Honeywell BULL Inc., Groupe BULL
and BULL HN Information Systems Inc. to the development of this operating system. 
Multics development was initiated by Massachusetts Institute of Technology Project MAC (1963-1970),
renamed the MIT Laboratory for Computer Science and Artificial Intelligence in the mid 1970s, under the leadership
of Professor Fernando Jose Corbato. Users consider that Multics provided the best software architecture 
for managing computer hardware properly and for executing programs. Many subsequent operating systems 
incorporated Multics principles.
Multics was distributed in 1975 to 2000 by Group Bull in Europe , and in the U.S. by Bull HN Information Systems Inc., 
as successor in interest by change in name only to Honeywell Bull Inc. and Honeywell Information Systems Inc. .

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Permission to use, copy, modify, and distribute these programs and their documentation for any purpose and without
fee is hereby granted,provided that the below copyright notice and historical background appear in all copies
and that both the copyright notice and historical background and this permission notice appear in supporting
documentation, and that the names of MIT, HIS, BULL or BULL HN not be used in advertising or publicity pertaining
to distribution of the programs without specific prior written permission.
    Copyright 1972 by Massachusetts Institute of Technology and Honeywell Information Systems Inc.
    Copyright 2006 by BULL HN Information Systems Inc.
    Copyright 2006 by Bull SAS
    All Rights Reserved