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multiple delete using sed

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# 1  
Old 07-20-2005
multiple delete using sed
Hi, I used to use sed to delete pattern from file using:

sed '/PATTERN/d' myfile

but how if I have 100 pattern to delete which is listed separated by new line in file called mypattern

sed -e '/PATTERN1/d' -e '/PATTERN2/d' and so on would be tedious

Can anyone help,

Thanks a lot
# 2  
Old 07-20-2005
hi u can try this

for i in `cat mypattern`
do
sed -e '/'$i'/d' myfile > myfile1
cp myfile1 myfile
done
rm -f myfile1

this is not an efficient one, u can try better than this.
# 3  
Old 07-20-2005
I have tried that method you proposed ...
but ... you only delete one specific pattern in each iteration and left the others which you will be retained when you delete another pattern.
In the end you end up with the same file as before.

I need to delete all patterns simultenously from myfile.

Anyway, thanks for your help Smilie
# 4  
Old 07-20-2005
Quote:
Originally Posted by matrixmadhan
hi u can try this

for i in `cat mypattern`
do
sed -e '/'$i'/d' myfile > myfile1
cp myfile1 myfile
done
rm -f myfile1

this is not an efficient one, u can try better than this.
Code:
while read pattern
do
sed -e '/$pattern/d' myfile > myfile1
mv myfile1 myfile
done < mypattern

# 5  
Old 07-20-2005
try:
Code:
grep -vf mypattern myfile

# 6  
Old 07-20-2005
Quote:
Originally Posted by asal_email
I have tried that method you proposed ...
but ... you only delete one specific pattern in each iteration and left the others which you will be retained when you delete another pattern.
In the end you end up with the same file as before.

I need to delete all patterns simultenously from myfile.

Anyway, thanks for your help Smilie
I dont think so i would end up with the same file as before.
Here's a test that i had run

cat pattern
tune
hai
good
work

cat myfile
such a nice tune
very good
shoud not be deleted
this is second one
yet another work
this also not to be deleted

output of what i had given
shoud not be deleted
this is second one
this also not to be deleted

i assume the example pattern and sample myfile what i had taken our correct and based on your requirement.
And it worked as expected.

Can u please check that once again. Thanks for ur reply.
# 7  
Old 07-20-2005
Quote:
Originally Posted by vino
Code:
while read pattern
do
sed -e '/$pattern/d' myfile > myfile1
mv myfile1 myfile
done < mypattern

vino i dont think your sed would work
you need to explicitly mention your search pattern as a string
as

sed -e '/'$pattern'/d' myfile > myfile1

or it was just a typo error.
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