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/usr/bin/marclint is in libmarc-lint-perl 1.52-1.

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#!/usr/bin/perl -w

=head1 NAME

marclint - MARC record linting utility

=head1 SYNOPSIS

B<marclint> [options] file(s)

=over 4

=item options

=over 4

=item --help

Print a summary of commands

=item --[no]stats

Print a statistical summary by file at the end.  (Default: on)

=back

=back

=cut

use strict;
use integer;

use MARC::File::USMARC;
use MARC::Lint;
use Getopt::Long;

use constant USAGE => <<"END";
Usage: marclint [options] file(s)
    options
        --help
            Print a summary of commands
        --version
            Print version
        --[no]quiet
            Suppress status messages
        --[no]stats
            Print a statistical summary by file at the end
END

my $stats = 1;
my $help = 0;
my $quiet = 0;

my $rc = GetOptions(
    "stats!" => \$stats,
    "quiet!" => \$quiet,
    "help"   => \$help,
    "version"   => sub { print "$0, using MARC::Record v$MARC::Record::VERSION\n"; exit 1; },
    );

my @files = @ARGV;

die USAGE if $help or (not $rc) or (@files == 0);

my $linter = new MARC::Lint;
my %counts;
my %errors;

for my $filename ( @files ) {
    $counts{$filename} = 0;
    $errors{$filename} = 0;

    my $file = MARC::File::USMARC->in( $filename ) or die $MARC::File::ERROR;
    warn "$filename\n" unless $quiet;

    while ( my $marc = $file->next() ) {
        if ( not $marc ) {
            warn $MARC::Record::ERROR;
            ++$errors{$filename};
        } else {
            ++$counts{$filename};
        }

        #store warnings in @warningstoreturn
        my @warningstoreturn = ();

        #retrieve any decoding errors
        #get any warnings from decoding the raw MARC
        push @warningstoreturn, $marc->warnings();

        $linter->check_record( $marc );

        #add any warnings from MARC::Lint
        push @warningstoreturn, $linter->warnings;

        if ( @warningstoreturn ) {
            print join( "\n",
                $marc->title,
                @warningstoreturn,
                "",
                "",
            );
            ++$errors{$filename};
        }
    } # while
    $file->close();
} # for 

if ( $stats ) {
    print "\n\n";
    print " Recs  Errs Filename\n";
    print "----- ----- --------\n";
    for my $key ( sort keys %counts ) {
        printf( "%5d %5d %s\n", $counts{$key}, $errors{$key}, $key );
    } # for
} # if stats