So count them as you print them. 

my %count;
## ...
if( "!!!" eq substr $line => 0, 3 ) {
  $count{ "!!!" }++;
  print OUTFILE $line;
}
## ...
print "Total errors for $_: $count{ $_ }\n" for qw( @@@ *** !!! );

[download]

Update: And no one else has mentioned it, but you might want while( defined( $line = <INFILE> ) ) { ... } if 0\n might occur in your input.</pedant>

In reply to Re: Counting lines as I write them... by Fletch
in thread Counting lines as I write them... by sigzero

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