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Full Discussion: Reading a string and passing passing arguments to a while loop
Top Forums Shell Programming and Scripting Reading a string and passing passing arguments to a while loop Post 302590146 by goddevil on Saturday 14th of January 2012 10:49:51 AM
Old 01-14-2012
Quote:
Originally Posted by zaxxon
If I got it right, you can break it down altering IFS:
Code:
OLDIFS=$IFS
IFS=":"
 
while read A B C; do
   do someting here with $A or $B or $C
done < infile
 
IFS=$OLDIFS

Thank you Zaxxon.

I understand from your code what you're trying to read the i/p file in the while loop. I actually want to read the value of the variable i from the for loop.

When i try to make the while loop from $i , i am getting the following error :
Quote:
$i: ambiguous redirect
Any thoughts?

---------- Post updated at 03:49 PM ---------- Previous update was at 03:27 PM ----------

Is there any way that the value of the variable i be stored in a file or a variable that can be read by the while loop.

I have tried writing to a file and it does not work.

Code:
for i in $( cat rparam.cfg | tail +$RESPONSE | head -$RESPONSESTOP | grep -v "^#" | grep ':' )
 
echo $i
$i > .tempparam
while read x y z
do
<stuff>
done < tempparam
rm -f tempparam
done

 

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LEARN ABOUT DEBIAN

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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