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Full Discussion: Creating variables dynamically and using it in script?
Top Forums Shell Programming and Scripting Creating variables dynamically and using it in script? Post 302565394 by Corona688 on Monday 17th of October 2011 07:01:14 PM
Old 10-17-2011
Since you have BASH you probably have egrep. It accepts multiple expressions like "a|b|c|d".

You can use IFS to split apart a string on ",", then put it back together with "|"

Since IFS changes how any splitting works in the shell you will want to put it back to what it was after!

Code:
#!/bin/bash

OLDIFS="$IFS"

while IFS=":" read FILE STRING
do
        IFS=","
        ARR=( $STRING )
        IFS="|"
        echo egrep "${ARR[*]}" $FILE
done < filename

IFS="$OLDIFS"

Code:
$ ./script.sh

egrep a|b|c|d file1
egrep e|f file2
egrep g|h|i|j|k|l file3

$

Remove the 'echo' to have it actually run egrep instead of just printing it.
This User Gave Thanks to Corona688 For This Post:
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LEARN ABOUT MINIX

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)
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