#!/usr/bin/perl

#
# dbcolrename.pm
# Copyright (C) 1991-2022 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

dbcolrename - change the names of columns in a fsdb schema

=head1 SYNOPSIS

dbcolrename OldName1 NewName1 [OldName2 NewName2] ...

=head1 DESCRIPTION

Dbcolrename changes the names of columns in a fsdb schema,
mapping OldName1 to NewName1, and so on for multiple pairs of column names.

Note that it is valid to do "overlapping" renames
like C<dbcolrename a b b a>.

=head1 OPTIONS

No non-standard options.

=for comment
begin_standard_fsdb_options

This module also supports the standard fsdb options:

=over 4

=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:

    #fsdb account passwd uid gid fullname homedir shell
    johnh * 2274 134 John_Heidemann /home/johnh /bin/bash
    greg * 2275 134 Greg_Johnson /home/greg /bin/bash
    root * 0 0 Root /root /bin/bash
    # this is a simple database

=head2 Command:

    cat DATA/passwd.fsdb | dbcolrename fullname first_last

=head2 Output:

    #fsdb      account passwd  uid     gid     first_last      homedir shell
    johnh * 2274 134 John_Heidemann /home/johnh /bin/bash
    greg * 2275 134 Greg_Johnson /home/greg /bin/bash
    root * 0 0 Root /root /bin/bash
    # this is a simple database
    #  | dbcolrename fullname first_last


=head1 SEE ALSO

L<Fsdb>.


=cut


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

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


=head1 AUTHOR and COPYRIGHT

Copyright (C) 1991-2022 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;