estract content form two file

[Marco_67]

Hello,

I have two files, file1 and file2.
I need to extract only those line from file2 that contains line text of file1.

Do I need some scripting or could it be done by concatenating commands ?
Please detail me about.

Thank you

[Suraj Singh_1]

I did not get your question..

Try "comm -12 file1 file 2" and see if it helps.

Rgds

[MarkSyder · Accepted solution]

I'm making two possibly incorrect assumptions:

1. you want to match the whole line

2. you want the output to go to a new file (file3)

> file3
for i in `cat file2`
do
grep $i file1 >> file3
done

This empties file3 before creating the new file3.

Mark Syder (like the drink but spelt different)

[Etienne Roseau]

Mark is writing faster than i do....
but this is also what i understood from your question.

[MarkSyder]

It's touch typing Ettienne ;-)

Mark

[Peter Godron]

Marco,
the comm -12 solution only works for sorted files and matches on complete lines!!
So please sort the files beforehand.

Would it be possible to provide a couple of example lines?

Regards

[Etienne Roseau]

hi Mark,
maybe 'cause of my nails (like my boss's charming blond secretary !)
;-)

[Muthukumar_5]

You can try as,

grep -f file1 file2

Else, get every line in file1 and do grep as like as,

while read line; do

grep $line file2

done < file1

hth.

[H.Merijn Brand (procura]

Muthkumar, that grep is both fast and dangerous!

What if the lines in file 1 have

.*

?

Ouch!

# perl -ne'BEGIN{local@ARGV=("file1");while(<>){$f1{$_}++}}exists$f1{$_}and print' file2 ...

Safe and simple

Enjoy, Have FUN! H.Merijn

[Peter Godron]

Marco,
can you please clarify:
1. Are the files sorted
2. Are you interested in matching the whole line of file1 against whole line of file2.
Regards