Greetings,
First thing first, have you tried anything? Do you have any running code that copy one file into another line by line?

The following snippet could do the trick, BUT you should understand what each line does: 

#!/usr/bin/perl
use strict;#dont let me do silly things
use warnings;#tell me if I try to do them anyway
use autodie;#halt and catch fire if things dont work out
my $keyword = qr/what/;#store the regex
open(my $fh,'<','input_file');#open input file for reading using $fh f
+ilehandle
open(my $outf,'>','output_file');#open output file for writing
while(<$fh>){
     if($_ =~ $keyword){#if the line matches te keyword then
        next;#jump to next line
     }
     print $outf $_;#print current line to the output file
}
close $fh;#cleanly close the input file
close $outf;#cleanly close the output file

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In reply to Re: How to remove a whole line if matches a keyword in a file. by QuillMeantTen
in thread How to remove a whole line if matches a keyword in a file. by Rahul2772

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