01-28-2020
No, when I try to encase the code with the code tags, it looks like it doesn't like the carriage returns and/or linefeeds.
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LEARN ABOUT DEBIAN
unblock_dlg
UNBLOCK_DLG(1) General Commands Manual UNBLOCK_DLG(1)
NAME
unblock_dlg - Insert linefeeds into an optional-format Digital Line Graph (DLG) file
SYNOPSIS
unblock_dlg [-L]
DESCRIPTION
The drawmap program processes USGS optional-format Digital Line Graph (DLG) files (along with other types of files) to produce customized
maps. Drawmap is able to read these files in their native format. However, since the files usually don't contain any linefeeds, they are
difficult for a human to read. Unblock_dlg filters a DLG file and inserts linefeeds for human readability. It takes input from the stan-
dard input and writes to the standard output. The input data must be in uncompressed form, not in gzip-compressed form. Also, unblock_dlg
does not work with SDTS DLG files.
Unblock_dlg normally takes no options, but, if you use the "-L" option, the program will print out some license information and exit.
Some DLG files already have embedded linefeeds. Unblock_dlg makes a feeble attempt to detect these files and abort. If the detection
fails, the results are likely to be garbled, so it is wise to check the format of each file first. The drawmap program, with the "-i"
option, will attempt to tell you whether a file contains linefeeds or not.
The intended use of unblock_dlg is simply to let you conveniently examine the files to see what is in them. However, if you are in the
mood for adventure, or if you need to repair a defective file, you can use unblock_dlg to make the file easy to edit, then you can edit the
file as desired. Drawmap can still process the files after linefeeds are inserted, but will become confused if any line (including the
linefeed) is more than 80 characters long. Drawmap may also become confused if you make any significant changes to the format of the file.
You can use this capability to remove selected items from DLG files, when those items cause problems. You may even be able to repair
faulty data. However, you need to be familiar with the content and structure of DLG files in order to do this effectively. You also need
to remember that drawmap depends on DLG files having a predictable structure, and it won't properly parse files that violate this pre-
dictability. Do this sort of thing only if you know what you are doing, or if you have a lot of free time on your hands.
It should be noted that you can obtain a similar effect by using the command recommended by the USGS:
dd if=inputfilename of=outputfilename ibs=8000 cbs=80 conv=unblock
I prefer the unblock_dlg command because it simply replaces the last byte of each record with a linefeed. This lets me easily tell how
long the original records were. The effect of unblock_dlg or dd can be undone by typing:
dd if=inputfilename of=outputfilename ibs=8000 cbs=80 conv=block
You may come across files that have a linefeed in the 81st byte. Drawmap doesn't like these, both because it can't tell (within the space
of the first 80-byte record) whether the file contains linefeeds or not, and because the records exceed the maximum record length of 80
bytes. You may be able to repair such files by blocking them with the above dd command.
SEE ALSO
unblock_dem(1), drawmap(1)
Jul 24, 2001 UNBLOCK_DLG(1)