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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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script(1)							   User Commands							 script(1)

NAME
script - make record of a terminal session SYNOPSIS
script [-a] [filename] DESCRIPTION
The script utility makes a record of everything printed on your screen. The record is written to filename. If no file name is given, the record is saved in the file typescript. See WARNINGS. The script command forks and creates a sub-shell, according to the value of $SHELL, and records the text from this session. The script ends when the forked shell exits or when Control-d is typed. OPTIONS
The following option is supported: -a Appends the session record to filename, rather than overwriting it. NOTES
script places everything that appears on the screen in filename, including prompts. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ |CSI |Enabled | +-----------------------------+-----------------------------+ SEE ALSO
attributes(5) WARNINGS
script can pose a security risk when used in directories that are writable by other users (for example, /tmp), especially when run by a privileged user, that is, root. Be sure that typescript is not a link before running script. SunOS 5.11 30 Jan 2004 script(1)
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