Linux and UNIX Man Pages

Test Your Knowledge in Computers #113
Difficulty: Easy
Linux is not Unix per se, but Linux is a Unix-like operating system.
True or False?
Linux & Unix Commands - Search Man Pages

cavern(1) [debian man page]

cavern(1)						      General Commands Manual							 cavern(1)

NAME
cavern -- process raw survey data SYNOPSIS
cavern [options] survex data file Description Cavern is the Survex data processing engine. If multiple survey data files are listed on the command line, they are processed in order from left to right. Settings are reset to their defaults before processing each file. Options -p, --percentage You can get cavern to display the percentage progress through the current file. As of Survex 0.90 this is disabled by default, but you can enable it if you want. Because the value given is for the current file, the values jump around for a multi-file sur- vey project. Also note that displaying this information slows down processing a little. -o, --output=OUTPUT Sets location for output files. -q, --quiet Only show a brief summary (--quiet --quiet or -qq will display warnings and errors only). -s, --no-auxiliary-files do not create .err file. -w, --warnings-are-errors turn warnings into errors. --log Send screen output to a .log file. Output Cavern reads in text files containing the survey data .svx) and outputs two files, with the extensions .3d and .err. By default these files are put in the current directory, with the same base filename as the first .svx file read, but a different extension. You can change the directory and/or base filename using the --output command line option. E.g. if you process the data file entrance.svx with the command cavern entrance entrance.3d and entrance.err will be created. Cavern also gives a range of statistics at the end of a successful run: o The highest and lowest stations and the height difference between them o The total length of the survey (before and after adjustment). This total excludes survey legs flagged as SURFACE, DUPLICATE, or SPLAY. o The number of stations and legs. Note that a *EQUATE is counted as a leg in this statistic. o The East-West and North-South ranges, and the North-most, South-most, East-most, and West-most stations. o The number of each size of node in the network (where size is number of connections to a station) i.e. a one node is the end of a dead-end traverse, a two-node is a typical station in the middle of a traverse, a three-node is a T-junction etc. o How long the processing took and how much CPU time was used. .3d - data describing the loop-closed centre line This file contains details of the stations and legs, and any flags associated with them. .err - loop closure statistics (%age errors, etc) This file contains statistics about each traverse in the survey which is part of a loop. It includes various statistics for each traverse, such as the percentage error per leg. You should study this information to determine if any parts of the survey are of lower quality or contain gross errors. Error Messages There are a number of error messages that you may get when processing data. Most of these are self explanatory, and will be caused by such problems as typing mistakes, or by your survey data not being attached to fixed points (in this situation, Survex will list some of the stations that are not connected). Along with the error message, the filename and line number of the offending line will be printed (or the filename for errors such as `file not found'). The format of the filename and line number is that used by gcc, so if your editor can parse errors from gcc, you should be able to set it to allow you to jump to the file and line of each error. Cavern will stop after more than 50 errors. This usually indicates something like the incorrect data order being specified. Deluging the user with error messages makes the actual problem less clear. See Also 3dtopos(1), aven(1), cad3d(1), diffpos(1), extend(1), sorterr(1), svxedit(1) cavern(1)

Featured Tech Videos