You are treading dangerously close to 1 liner territory here! I shall resist the temptation, though I predict others won't ;-)

Here is how I would do it :- 

#!/usr/bin/perl -w -p -i.bak
use strict;
my $kill = join "|", qw{
  wahwah
  blahblah
  yadayada
};

while (<>) {
    s/$kill//go;          # remove unwanted strings
    s/^\s+//g;            # blank lines
}

[download]
Pass a list of files you want changed in on the command line - this will edit them in place (the -i flag) saving the old ones with a .bak extension.

In reply to Re: elementary hash by ncw
in thread elementary hash, STDIN questions by ybiC

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