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Full Discussion: replace lines in a file
Top Forums Shell Programming and Scripting replace lines in a file Post 302298006 by TehOne on Monday 16th of March 2009 11:59:02 AM
Old 03-16-2009
Quote:
Originally Posted by zaxxon
This will replace the original file. For just testing, remark the 2nd line.
Code:
awk '{printf "%.2f GB\n",  ($1/1024/1024)}' infile > infile.tmp
mv infile.tmp infile

This does indeed solve the problem but only for the example I gave, your solution would calculate and replace ALL the numbers into GB and that's fine if the user does specify the unit, however in another part of my script I choose the unit automatically (MB/GB/TB) therefor I need a solution to replace the numbers one by one (each different size unit) and not file wide!

Example:

Code:
          for number in `cat $TMP2` ;do
            if (($number>=1024000000)); then
              CALC=$(awk -v a="$number" 'BEGIN{printf "%.2f\n TB",  a/1024/1024/1024}')
            elif (($$number>=1024000)); then
              CALC=$(awk -v a="$number" 'BEGIN{printf "%.2f\n GB",  a/1024/1024}')
            elif (($number<1024000)); then
              CALC=$(awk -v a="$number" 'BEGIN{printf "%.2f\n MB",  a/1024}')
            fi
            sed -i 's/$number/$CALC/g' $TMP2
          done

Only the sed part that is actually suppose to replace the number doesn't work.
Last edited by TehOne; 03-16-2009 at 01:31 PM..
 

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LEARN ABOUT LINUX

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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