02/27/85  truncate, tc

Syntax as a command:  tc {-control_arg} path {length}
                 or:  tc segno {length}


Function: truncates a segment to an optionally specified length and
resets the bit count accordingly, setting the bit count author to be
the user who invoked the command.


Arguments:
path
   is the pathname of a segment.  You can't use the star convention.
length
   is an octal integer indicating the length of the segment in words
   after truncation.  If you don't provide length, zero is assumed.
segno
   is an octal segment number.


Control arguments:
-name, -nm
   specifies that the octal number following it is a pathname.


Access required: You need write access on the segment to be truncated.


Notes: If the segment is already shorter than the specified length,
its length is unchanged, but the bit count is set to the length given.

Don't use truncate on segments that are, or are components of,
structured files.

If you use truncate on a consistent MSF, it is operated on as in a
single segment.  If the truncation length is less than the current
length, components are deleted until the sum of the bit counts of all
the components is equal to the truncation length; if the truncation
length is greater than that sum, components are created as needed.


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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