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Top Forums Shell Programming and Scripting Padding lines in a file with newlines Post 302392579 by npatwardhan on Thursday 4th of February 2010 10:31:06 PM
Old 02-04-2010
These numbers are extracted from another file which has groups of 10. All I want is to pad the file which has missing entries, with newlines. Will it be easier if I modify the original file as follows:

Code:
55
6
77
8
88
98
7
85
45
544

1
33
32
13

13
23
44
11
67
87

243
56
344
23
133
1343
12
10

1155
321
15
899
654

So now I have inserted a newline between individual groups.Group1 has all 10 entries, group 2 has only 4 entries (that means I will have to add 6 newlines), group 3 has 6 entries (so I will have to add 4 lines) and so on.

Hope this helps.
 

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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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