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Old 03-23-2002, 02:03 AM   #1
Registered: Mar 2002
Location: ma
Distribution: slackware
Posts: 747

Rep: Reputation: 30
help this to make this sed efficient plz

i'm a newbie to sed..

i'm gonna run this script on really really big file
(almost 1gig)

i think it should be really efficient
could u guys help me out?

thankyou !!

#! /bin/bash

sed -e 's/<Topic r:id=\"//g' $inputfile |
sed -e 's/\">$//g' |
sed -e 's/\"\/>$//g' |
sed -e 's/<tag catid=\"//g' |
sed -e 's/^\".*//g' |
sed -e 's/<d:Title.*$//g'|
sed -e 's/<link r:.*$//g' |
sed -e 's/<\/Topic>//g' |
sed -e 's/<ExternalPage about\=\"//g' |
sed -e 's/<description>//g' |
sed -e 's/<\/description>//g' |
sed -e 's/<\/ExternalPage>//g' |
sed -e 's/^$//g' |
#sed -e 's/^Top.*\n$//g' |
awk '{
if ( $0 ~ /^Top/ )
printf("%s ", $0)
print $0
}' |

sed -e '/^$/d'

thank you!
Old 03-25-2002, 06:57 AM   #2
Senior Member
Registered: Dec 2001
Location: The Netherlands
Distribution: Ubuntu
Posts: 1,316

Rep: Reputation: 47
I don't think it's that inefficient. You are passing the data through pipes so it will just have to read the file from disk once. You just need to add something like "> newfile" to the end. Because the way you have it now you'll just get everything on stdout. However you will need an extra gig free to write the newfile.
You can run multiple commands with one sed call though which might speed things up a bit.

cat numbers | sed -e '/one/two/' -e '/three/four/'


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