Argument "sdAb_1193_LgLlama" isn't numeric in printf at ../duplicate.pl line 35, <$PROTFILE> chunk 165.
'Redundant argument in printf at ../duplicate.pl line 35, <$PROTFILE> chunk 1164.'

##</code><code>##

#!/usr/bin/perl
# cleanup.pl
use strict;
use warnings;

print 'Enter protein sequence filename: ';
chomp( my $prot_filename = <STDIN> );

open my $PROTFILE, '<', $prot_filename
  or die "Cannot open '$prot_filename' because: $!";

my $out_filename = 'duplicates_entries_in_'.$prot_filename;
open my $OUTFILE, '>', $out_filename
  or die "Cannot open '$out_filename' because: $!";

$/ = ''; # Set paragraph mode

my $name;
my %fasta_seen;

FASTA_RECORD:
while ( my $para = <$PROTFILE> ) {
  # Remove fasta header line
  if ( $para =~ s/^>(.*)//m ){
     $name = $1;
  };
  # Remove comment line(s)
  $para =~ s/^\s*#.*//mg;

  # Trim trailing white space
  $para =~ s/\s+$//;

 # next FASTA_RECORD if $fasta_seen{ $para }++;
if ( $fasta_seen{ $para }++ ){
  printf "%d duplicate records written\n",$name,$para,$out_filename;
  next FASTA_RECORD;
}
}
print "\n";