Delete Multiple Line using linux command

Posted on 2014-01-07
Last Modified: 2014-11-18

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?
Question by:skywill
LVL 45

Expert Comment

by:Kent Olsen
ID: 39763052
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!

Author Comment

ID: 39763091
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 ?
LVL 45

Assisted Solution

by:Kent Olsen
Kent Olsen earned 125 total points
ID: 39763106
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
LVL 38

Accepted Solution

Gerwin Jansen, EE MVE earned 125 total points
ID: 39763137
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)
LVL 27

Expert Comment

ID: 39835407
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

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