08-13-2012
You cannot nest quotes inside quotes, and still expect them to work. Quotes do not work that way. Any methods you can kludge them into working with are, by definition, severe security holes, because if the shell is re-evaluating quotes, it will also re-evaluate backticks and the like. Someone could feed `rm -Rf ~/` into your program and it would do it.
Usually, if you're trying to do that, there's better ways to solve the problem which have been overlooked. But to know how to solve your problem, first we need to know what it is, and we don't.
We know how you're trying to solve it -- put a whole command in a variable -- but have no idea why you're trying to put a whole command in a variable. Usually, there's zero need to do so.
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LEARN ABOUT V7
ppmquantall
ppmquantall(1) General Commands Manual ppmquantall(1)
NAME
ppmquantall - run ppmquant on a bunch of files all at once, so they share a common colormap
SYNOPSIS
ppmquantall [-ext extension] ncolors ppmfile ...
DESCRIPTION
Takes a bunch of portable pixmap as input. Chooses ncolors colors to best represent all of the images, maps the existing colors to the new
ones, and overwrites the input files with the new quantized versions.
If you don't want to overwrite your input files, use the -ext option. The output files are then named the same as the input files, plus a
period and the extension text you specify.
Verbose explanation: Let's say you've got a dozen pixmaps that you want to display on the screen all at the same time. Your screen can
only display 256 different colors, but the pixmaps have a total of a thousand or so different colors. For a single pixmap you solve this
problem with ppmquant; this script solves it for multiple pixmaps. All it does is concatenate them together into one big pixmap, run
ppmquant on that, and then split it up into little pixmaps again.
(Note that another way to solve this problem is to pre-select a set of colors and then use ppmquant's -map option to separately quantize
each pixmap to that set.)
SEE ALSO
ppmquant(1), ppm(5)
AUTHOR
Copyright (C) 1991 by Jef Poskanzer.
27 July 1990 ppmquantall(1)