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Full Discussion: Parsing a file
Top Forums Shell Programming and Scripting Parsing a file Post 302177901 by era on Monday 24th of March 2008 02:58:33 AM
Old 03-24-2008
Quote:
Originally Posted by aol12123
1. Whitespaces of the file are not maintained.
2. Text (****************************************) is not getting printed.Its getting translated to the script file name.
Both of these are symptoms of inadequate quoting. The asterisk is a wildcard which gets expanded to a list of file names unless you quote it; perhaps it would be wise to use a different separator.

Quote:
#!/usr/bin/sh
i=1
cat sample.txt | while read line
do
(This, of course, is a Useless Use of Cat. The recommended idiom is
Code:
while read line
do
   : ...
done <sample.txt

... But don't worry too much about this stylistic detail.)

Quote:
var1="END"
var2="BEGIN"
toPrint=`echo $line | cut -c1-7`
toPrintText=`echo $line | cut -c8-`
elif [[ $toPrint == 'TOPRINT' ]]
then
echo toPrintText
See how far you can get just by judiciously quoting everything. The use of echo inside backticks is probably going to ruin some of your whitespace anyway -- quite frankly, I would not use a shell script for this. But try modifications like

Code:
var1="END"
var2="BEGIN"
toPrint="`echo "$line" | cut -c1-7`" 
toPrintText="`echo "$line" | cut -c8-`" 
elif [[ "$toPrint" == 'TOPRINT' ]]
	then
	echo "$toPrintText"

(I also added the missing dollar sign on the last line.)

Your "elif" seems to be missing the initial "if" but that's trivial, of course.
Last edited by era; 03-24-2008 at 04:28 AM..
 

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LEARN ABOUT OSX

ppmtopgm

ppmtopgm(1)						      General Commands Manual						       ppmtopgm(1)

NAME

       ppmtopgm - convert a portable pixmap into a portable graymap

SYNOPSIS

       ppmtopgm [ppmfile]

DESCRIPTION

       Reads  a  portable  pixmap  as  input.  Produces a portable graymap as output.  The output is a "black and white" rendering of the original
       image, as in a black and white photograph.  The quantization formula used is .299 r + .587 g + .114 b.

       Note that although there is a pgmtoppm program, it is not necessary for simple conversions from pgm to ppm , because any  ppm  program  can
       read  pgm  (and	pbm  ) files automatically.  pgmtoppm is for colorizing a pgm file.  Also, see ppmtorgb3 for a different way of converting
       color to gray.  And ppmdist generates a grayscale image from a color image, but in a way that makes it easy to differentiate  the  original
       colors, not necessarily a way that looks like a black and white photograph.

QUOTE

       Cold-hearted orb that rules the night
       Removes the colors from our sight
       Red is gray, and yellow white
       But we decide which is right
       And which is a quantization error.

SEE ALSO

       pgmtoppm(1),ppmtorgb3(1),rgb3toppm(1),ppmdist(1),ppm(5),pgm(5)

AUTHOR

       Copyright (C) 1989 by Jef Poskanzer.

								   10 April 2000						       ppmtopgm(1)
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