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Full Discussion: Can any programmer do this task in shell script...
Top Forums Shell Programming and Scripting Can any programmer do this task in shell script... Post 302734927 by Don Cragun on Friday 23rd of November 2012 05:42:45 AM
Old 11-23-2012
Looking at the Output_needed_format.txt file and looking at the 1st 9 lines, I thought I saw a pattern and knew what you wanted. But, the last 9 lines (not exactly corresponding to the #Levels value 10 and having no data in the z* columns and the 1* columns in the output) don't make any sense to me.

If you want our help on this, please post the complete output that you want to get from the following entries in Input.txt:
Code:
 OUTPUT FROM ASCII FILE: CAST #1
 OUTPUT FROM ASCII FILE: CAST #2
 OUTPUT FROM ASCII FILE: CAST #3
and
 OUTPUT FROM ASCII FILE: CAST #50

and answer a few questions:
  1. The input records have data in columns with headers z, 1, 2, and 3. Does the code we supply need to make a pass through the input for the exact set of fields supplied in the files to be processed, or should the code always assume there are just the above four sets of data included in Input.txt?
  2. Does the code need to reformat floating point values to remove trailing zeros, or can it just print the values found in the input?
  3. When printing floaing point values, do the decimal points need to line up?
  4. Does the code need to verify that the #Levels field value exactly matches the number of data lines after the z header line? If so, what should be done if there is a mismatch? Should the code make any other data validity checks? If so, what checks and what should be done if the checks fail?
 

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LEARN ABOUT V7

ppmtosixel

ppmtosixel(1)						      General Commands Manual						     ppmtosixel(1)

NAME

       ppmtosixel - convert a portable pixmap into DEC sixel format

SYNOPSIS

       ppmtosixel [-raw] [-margin] [ppmfile]

DESCRIPTION

       Reads  a  portable  pixmap  as input.  Produces sixel commands (SIX) as output.	The output is formatted for color printing, e.g. for a DEC
       LJ250 color inkjet printer.

       If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled.  A printer control header and a color assignment table
       begin the SIX file.  Image data is written in a compressed format by default.  A printer control footer ends the image file.

OPTIONS

       -raw   If  specified,  each  pixel  will  be explicitly described in the image file.  If -raw is not specified, output will default to com-
	      pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands.  A raw file is often an order	of  magni-
	      tude larger than a compressed file and prints much slower.

       -margin
	      If  -margin  is not specified, the image will be start at the left margin (of the window, paper, or whatever).  If -margin is speci-
	      fied, a 1.5 inch left margin will offset the image.

PRINTING

       Generally, sixel files must reach the printer unfiltered.  Use the lpr -x option or cat filename > /dev/tty0?.

BUGS

       Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion.  If the original PPM maxval was
       greater	than  100,  rescaling  also reduces the image depth.  While the actual RGB values from the ppm file are more or less retained, the
       color palette of the LJ250 may not match the colors on your screen.  This seems to be a printer limitation.

SEE ALSO

       ppm(5)

AUTHOR

       Copyright (C) 1991 by Rick Vinci.

								   26 April 1991						     ppmtosixel(1)
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