Delete Multiple Line using linux command


I have two .txt files which content email list ,
File one named : old.txt

That contains :

file two named : delete.txt

What I need to ask if how can I delete the lines for old.txt using delete.txt pattern?
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Kent OlsenDBACommented:
Hi skywill,

You can use any of at least a half dozen utility programs (awk, sed, grep, etc.) to do this.  Join works well, too.

Try this:

 join -v1 -v2 < (sort old.txt) < (sort delete.txt)

Good Luck!
skywillAuthor Commented:
what I need is when I run the command , the old.txt will have only left these email :

so the the result is and deleted from old.txt

do ur command work ?
Kent OlsenDBACommented:
Those commands will generate the results that you're looking for and write them to standard output.

Just redirect the output to the desired file.  You'll probably want to write the results to a temporary file, then copy that file back over old.txt

 join -v1 -v2 < (sort old.txt) < (sort delete.txt) > new.txt
 cp new.txt old.txt
Gerwin Jansen, EE MVETopic Advisor Commented:
grep -v -f delete.txt old.txt

(will use patterns from old.txt to find non-matching lines from delete.txt)

grep -v -f delete.txt old.txt  > new.txt

(new.txt will contain your filtered output)

grep -v -f delete.txt old.txt  > new.txt ; mv new.txt old.txt

(and rename new.txt to old.txt)

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
the proper use of join is :

$ sort old.txt > old.txt.sorted
$ sort delete.txt > delete.txt.sorted
$ join -a1 -v2 old.txt.sorted delete.txt.sorted


this is much simpler and does not change the order of the addresses nor spend time sorting them

$ grep -v -f delete.txt old.txt
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Editors IDEs

From novice to tech pro — start learning today.