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Full Discussion: Parsing Output of a Variable
Top Forums Shell Programming and Scripting Parsing Output of a Variable Post 302637379 by bakunin on Tuesday 8th of May 2012 07:35:20 PM
Old 05-08-2012
Quote:
Originally Posted by SkySmart
how would i nest something like this:

Code:
VARA=$(for all in `echo fat skinny fine ugly`
do 
echo $all
done)

Please use CODE-tags when posting code or terminal output. It makes the reading much easier and preserves indentation.

To answer your question: you want to split at word boundaries. As the shells default IFS (internal field separator - the character which is used to delimit words) is the space character already you need to do nothing, because the whole "echo" is superfluous:

Code:
VARA=$(for all in fat skinny fine ugly ; do
     echo $all
done)

Notice the difference between:

Code:
for all in fat skinny fine ugly ; do
     echo $all
done

and

Code:
for all in "fat skinny fine ugly" ; do
     echo $all
done

The difference is caused because the double quote is used exactly for this purpose: to tell the shell not to interpret the IFS character in its function but as mere normal character.

I suggest you read the man page of ksh about the IFS character and the IFS special variable.

I hope this helps.

bakunin
 

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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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