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Full Discussion: Using a variable as a for loop expression
Top Forums Shell Programming and Scripting Using a variable as a for loop expression Post 302704375 by Corona688 on Friday 21st of September 2012 01:07:58 PM
Old 09-21-2012
A normal for-loop? I don't see why you've taken this approach at all.

I'm trying to work on an expanded version of this:

Code:
for Y in 19n 18n 17n ... 17s 18s 19s
do
        ARGS=""
        for X in 19w 18w 17w ... 17e 18e 19e
        do
                ARGS="$ARGS +append $Y$X.png"
        done

        convert $ARGS $Y.png
done

...but running into memory limitations. I may have to shrink all the images before I begin. Which makes sense since I'd have to shrink them severely to view the entire image at once anyway.
 

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LEARN ABOUT CENTOS

advdef

AdvanceCOMP Deflate Compression Utility(1)		      General Commands Manual			AdvanceCOMP Deflate Compression Utility(1)

NAME

       advdef - AdvanceCOMP Deflate Compression Utility

SYNOPSIS

       advdef [-z, --recompress] [-0, --shrink-store]
	    [-1, --shrink-fast] [-2, --shrink-normal] [-3, --shrink-extra]
	    [-4, --shrink-insane] [-f, --force] [-q, --quiet]
	    [-h, --help] [-V, --version] FILES...
DESCRIPTION

       The main purpose of this utility is to recompress the data present in the .png, .mng, .gz, .tgz and .svgz files.

       The internal structure of the files isn't changed.  Only the compressed data is modified.

OPTIONS

       -z, --recompress FILES...
	      Recompress  the  specified  files.  If the -1, -2, -3, -4 options are specified it's used the smallest file choice from the previous
	      compressed data and the new compression. If the -0 option is specified the file is always rewritten without any compression.

       -0, --shrink-store
	      Disable the compression. The file is only stored and not compressed. The file is always rewritten also if it's bigger.

       -1, --shrink-fast
	      Set the compression level to "fast".

       -2, --shrink-normal
	      Set the compression level to "normal". This is the default level of compression.

       -3, --shrink-extra
	      Set the compression level to "extra".

       -4, --shrink-insane
	      Set the compression level to "insane". It's VERY SLOW.

       -f, --force
	      Force the use of the new file also if it's bigger.

LIMITATIONS

       The advdef program cannot be used to recompress huge files because it needs to allocate memory for both the complete compressed and  uncom-
       pressed data.

COPYRIGHT

       This file is Copyright (C) 2003, 2004 Andrea Mazzoleni

SEE ALSO

       advpng(1), advmng(1), advzip(1), gzip(1), bzip2(1)

													AdvanceCOMP Deflate Compression Utility(1)
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