#!/usr/bin/perl -w

#
# dbfilecat.pm
# Copyright (C) 2013-2018 by John Heidemann <johnh@isi.edu>
#
# This program is distributed under terms of the GNU general
# public license, version 2.  See the file COPYING
# in $dblibdir for details.
#


=head1 NAME

dbfilecat - concatenate two files with identical schema

=head1 SYNOPSIS

    dbfilecat --input A.fsdb [--input B.fsdb...]

or

    echo A.fsdb | dbfilecat --xargs


=head1 DESCRIPTION

Concatenate all provided input files,
producing one result.
We remove extra header lines.

Inputs can both be specified with C<--input>, or one can come
from standard input and the other from C<--input>.
With C<--xargs>, each line of standard input is a filename for input.

Inputs must have identical schemas (columns, column order,
and field separators).

Like L<dbmerge>, but no worries about sorting,
and with no arguments we read standard input
(although that's not very useful).


=head1 OPTIONS

General option:

=over 4

=item B<--xargs>

Expect that input filenames are given, one-per-line, on standard input.
(In this case, merging can start incrementally.

=item B<--removeinputs>

Delete the source files after they have been consumed.
(Defaults off, leaving the inputs in place.)

=for comment
begin_standard_fsdb_options

This module also supports the standard fsdb options:

=item B<-d>

Enable debugging output.

=item B<-i> or B<--input> InputSource

Read from InputSource, typically a file name, or C<-> for standard input,
or (if in Perl) a IO::Handle, Fsdb::IO or Fsdb::BoundedQueue objects.

=item B<-o> or B<--output> OutputDestination

Write to OutputDestination, typically a file name, or C<-> for standard output,
or (if in Perl) a IO::Handle, Fsdb::IO or Fsdb::BoundedQueue objects.

=item B<--autorun> or B<--noautorun>

By default, programs process automatically,
but Fsdb::Filter objects in Perl do not run until you invoke
the run() method.
The C<--(no)autorun> option controls that behavior within Perl.

=item B<--help>

Show help.

=item B<--man>

Show full manual.

=back

=for comment
end_standard_fsdb_options


=head1 SAMPLE USAGE

=head2 Input:

File F<a.fsdb>:

    #fsdb cid cname
    11 numanal
    10 pascal

File F<b.fsdb>:

    #fsdb cid cname
    12 os
    13 statistics

=head2 Command:

    dbfilecat --input a.fsdb --input b.fsdb


=head2 Output:

    #fsdb      cid     cname
    11 numanal
    10 pascal
    12 os
    13 statistics
    #  | dbmerge --input a.fsdb --input b.fsdb

=head1 SEE ALSO

L<dbmerge(1)>,
L<Fsdb(3)>

=cut


# WARNING: This code is derived from dbfilecat.pm; that is the master copy.

use Fsdb::Filter::dbfilecat;
my $f = new Fsdb::Filter::dbfilecat(@ARGV);
$f->setup_run_finish;  # or could just --autorun
exit 0;


=head1 AUTHOR and COPYRIGHT

Copyright (C) 2013-2018 by John Heidemann <johnh@isi.edu>

This program is distributed under terms of the GNU general
public license, version 2.  See the file COPYING
with the distribution for details.

=cut

1;