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Top Forums Shell Programming and Scripting First Time need help on UNIX Command Post 302997534 by RavinderSingh13 on Tuesday 16th of May 2017 01:44:04 AM
Old 05-16-2017
Quote:
Originally Posted by srilu
I just noticed that command above is not written anything on input file ,its idle
---------- Post updated at 04:36 PM ---------- Previous update was at 03:59 PM ----------
Can you help on this.
Hello Srilu,

Rushing while posting your questions will not help us. I think you have never posted like you want the changes inside the Input_file? If this is the case then you may need to take the output of my command into a temp_file and then rename it again as your Input_file like as follows.
Code:
awk '{VAL=$0 !~ /^<code/?(VAL?VAL ORS $0:$0):(VAL?VAL $0:$0)} END{print VAL}'   Input_file > temp_file && mv temp_file  Input_file

I hope this helps you, if your requirement is different then please take sometime and rephrase your questions in detailed manner so that we could try to help you.

Thanks,
R. Singh

Last edited by RavinderSingh13; 05-16-2017 at 02:50 AM..
 

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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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