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Top Forums Shell Programming and Scripting search of common words in set of files Post 302321280 by cfajohnson on Sunday 31st of May 2009 12:28:25 PM
Old 05-31-2009
Quote:
Originally Posted by mala
I have the following code in bash, which is working well, but it involves very high computational cost with the increase of the file and set size.

You use far too many external commands where they are not encessary. They slow down the script by a large factor.
Quote:
Any suggestion for better checking for the words is much appreciated.

My code segment:
Code:
#!/bin/sh
rm -f feat.txt 
touch feat.txt 
rm -f tem.txt
touch tem.txt


You are calling four external commands (rm and touch twice each); you don't need any:

Code:
> feat.txt
> tem.txt

Quote:
Code:
#read the rows of set file s.txt and put into seperate files 
lables=1
while read myline
  do
   echo $myline > temp.txt
   cat temp.txt|awk '{for (i=1;i<=NF;i++) print $i}'|sort|uniq > l$lables.txt


You don't need cat and uniq. And tr will be faster than awk.

Code:
tr -s ' ' '\n' < temp.txt | sort -u

Quote:
Code:
   lables=`expr $lables + 1`


The shell can do integer arithmetic; you don't need expr:

Code:
lables=$(( $lables + 1 ))

Quote:
Code:
  done < s.txt
p=`wc -l s.txt| awk '{print $1}'`


You don't need awk:

Code:
p=$( wc -l < s.txt )

Quote:
Code:
q=`expr $p - 1`


Code:
q=$(( $p - 1 ))

Quote:
Code:
a=1
c=`expr $a + $q`


Code:
c=$(( $a + $q ))

Quote:
Code:
while [ $a -le $c ]
  do
  rm -f a.txt
  touch a.txt


You don't need rm and touch.

Code:
> a.txt

Get rid of all instances of cat and expr from the rest of the script.
Quote:
Code:
  fileno=1
  while [ $fileno -le 1000 ]
   do
     cat l$a.txt|fgrep -xvf $fileno.txt| awk '{printf ($1 " ")}' >> a.txt
     echo >>a.txt
     fileno=`expr $fileno + 1`
   done 
  cat a.txt |awk '{if ($0 != NULL) print "0"; if ($0 == null) print "1"}'>c.txt
  paste c.txt feat.txt > feat1.txt
  cat feat1.txt >feat.txt
  a=`expr $a + 1`
 done

Thank you in advance
 

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