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Top Forums Shell Programming and Scripting awk changes to make it faster Post 302808149 by mirwasim on Thursday 16th of May 2013 02:54:39 AM
Old 05-16-2013
awk changes to make it faster

I have script like below, who is picking number from one file and and searching in another file, and printing output.

Bu is is very slow to be run on huge file.can we modify it with awk

Code:
#! /bin/ksh
while read line1
do
echo "$line1"
a=`echo $line1`
if [ $a -ge 0 ]
then
echo "$num"
cat file1|nawk -v "c=$line1" '$1 ~ c' >> message.log
fi
done < file2

.

file2 has below data
Code:
cat file2
1234
5678
9100
1324

file 1 has string which contain this data in that.
 

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DIFF3(1)						      General Commands Manual							  DIFF3(1)

NAME
diff3 - 3-way differential file comparison SYNOPSIS
diff3 [ -ex3 ] file1 file2 file3 DESCRIPTION
Diff3 compares three versions of a file, and publishes disagreeing ranges of text flagged with these codes: ==== all three files differ ====1 file1 is different ====2 file2 is different ====3 file3 is different The type of change suffered in converting a given range of a given file to some other is indicated in one of these ways: f : n1 a Text is to be appended after line number n1 in file f, where f = 1, 2, or 3. f : n1 , n2 c Text is to be changed in the range line n1 to line n2. If n1 = n2, the range may be abbreviated to n1. The original contents of the range follows immediately after a c indication. When the contents of two files are identical, the contents of the lower-numbered file is suppressed. Under the -e option, diff3 publishes a script for the editor ed that will incorporate into file1 all changes between file2 and file3, i.e. the changes that normally would be flagged ==== and ====3. Option -x (-3) produces a script to incorporate only changes flagged ==== (====3). The following command will apply the resulting script to `file1'. (cat script; echo '1,$p') | ed - file1 FILES
/tmp/d3????? /usr/lib/diff3 SEE ALSO
diff(1) BUGS
Text lines that consist of a single `.' will defeat -e. Files longer than 64K bytes won't work. DIFF3(1)
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