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Full Discussion: script to add numbers is slow
Top Forums Shell Programming and Scripting script to add numbers is slow Post 302300299 by macsurveyr on Monday 23rd of March 2009 07:31:44 PM
Old 03-23-2009
script to add numbers is slow
Hi,

I am running a BASH shell with the following script. The script works and gives me correct output but is very slow with large files. The more rows and columns (width and height) the slower as you can probably see.

How can I do what I want more efficiently? Any ideas welcome. It has been ages since I have gone down the scripting road and - wow - it is slow to come back.

Thanks in advance.

i=$(($WIDTH * $HEIGHT - $WIDTH - 1))
k=$(($WIDTH - 1))
for ((j=0;j<$i;j++))
do
if [[ $j -eq $k ]]
then echo $((k=$(($k + $WIDTH))))
else
second=$(( j + 1 ))
third=$(( j + WIDTH + 1))
fourth=$(( j + WIDTH))
echo "4 $j $second $third $fourth" >> file.out
fi
done
 

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	   The document inside the XPS file to convert. By default, the first document of the XPS file is used.

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	   The first page to convert.

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	   The last page to convert.

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	   Convert only odd pages.

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	   Convert only even pages.

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	   Horizontal and vertical resolution in PPI (Pixels Per Inch). The default is 150 PPI.

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