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Full Discussion: Uncommenting the file
Top Forums Shell Programming and Scripting Uncommenting the file Post 302656013 by midhun19 on Thursday 14th of June 2012 06:42:35 AM
Old 06-14-2012
Uncommenting the file

hi i have a file in the below fomat
Code:
######################################
# some data
# .....
######################################
file value 
# param1 
# param2

I want to remove the comment of the parameters but not the header...i want the file in the below format
Code:
######################################
# some data
# .....
######################################
file value 
param1 
param2

I have used
Code:
sed -e 's/^#[ ]*//g' <file name>

but this uncommenting the header also and giving me

Code:
######################################
 some data
.....
 ######################################
 file value 
 param1 
param2

is there any way to start replace only after the line after "file value" ie ,if i get the file value line number (in this case 5), can we ask the sed to start replacing only after 5 th line till the end of the file

Moderator's Comments:
Mod Comment Please use code tags, thanks!

Last edited by zaxxon; 06-14-2012 at 07:52 AM.. Reason: code tags, see PM
 

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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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