04-23-2012
Jeg,
What am I expecting? Nothing.
You asked a question, that is akin to sending an email to a room full of doctors that says "My leg hurts. Why?"
You have provided no details as to the flavor of Linux, the kernel version, any errors that were seen in the logs, what software it was running, how long it was running, and any system specifications.
So... how's your leg?
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LEARN ABOUT DEBIAN
extend
extend(1) General Commands Manual extend(1)
NAME
extend -- produce an extended elevation from a .3d file
SYNOPSIS
extend [--specfile configuration .espec file] input .3d file [output .3d file]
Description
Note:
The extend program can also work on Compass .plt (as can aven and any other Survex program which reads .3d files).
If no specfile is given, extend starts with the highest station marked as an entrance which has at least one underground survey leg
attached to it. If there are no such stations, the highest deadend station in the survey (or the highest station if there are no deadends)
is used. Extend puts the first station on the left, then folds each leg out individually to the right, breaking loops arbitrarily (usually
at junctions).
If the output filename is not specified, extend bases the output filename on the input filename, but ending "_extend.3d". For example,
extend deep_pit.3d produces an extended elevation called deep_pit_extend.3d.
This approach suffices for simple caves or sections of cave, but for more complicated situations human intervention is required. More com-
plex sections of cave can be handled with a specfile giving directions to switch the direction of extension between left and right, to
explicitly specify the start station, or to break the extension at particular stations or legs.
The specfile is in a format similar to cavern's data format:
;This is a comment
; start the elevation at station entrance.a
*start entrance.a ;this is a comment after a command
; start extending leftwards from station half-way-down.5
*eleft half-way-down.5
; change direction of extension at further-down.8
*eswap further-down.8
; extend right from further-down.junction, but only for
; the leg joining it to very-deep.1, other legs continuing
; as before
*eright further-down.junction very-deep.1
; break the survey at station side-loop.4
*break side-loop.4
; break survey at station side-loop.junction but only
; for leg going to complex-loop.2
*break side-loop.junction complex-loop.2
This approach requires some trial and error, but gives useful results for many caves. The most complex systems would benefit from an
interactive interface to select and view the breaks and switches of direction.
See Also
3dtopos(1), aven(1), cad3d(1), cavern(1), diffpos(1), sorterr(1), svxedit(1)
extend(1)