#!/usr/bin/perl

#
# dbrow.pm
# Copyright (C) 1991-2018 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

dbrow - select rows from an Fsdb file based on arbitrary conditions

=head1 SYNOPSIS

dbrow [-vw] CONDITION [CONDITION...]

=head1 DESCRIPTION

Select rows for which all CONDITIONS are true.
Conditions are specified as Perl code,
in which column names are be embedded, preceded by underscores.

=head1 OPTIONS

=over 4

=item B<-v>

Invert the selection, picking rows where at least one condition does
I<not> match.

=back

=for comment
begin_standard_fsdb_options

This module also supports the standard fsdb options:

=over 4

=item B<-d>

Enable debugging output.

=item B<-w> or B<--warnings>

Enable warnings in user supplied code.

=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<--header> H

Use H as the full Fsdb header, rather than reading a header from
then input.

=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 | dbrow '_fullname =~ /John/'

=head2 Output:

    #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
    # this is a simple database
    #  | /home/johnh/BIN/DB/dbrow 


=head1 BUGS

Doesn't detect references to unknown columns in conditions.

END
    #' for font-lock mode.
    exit 1;

=cut


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

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


=head1 AUTHOR and COPYRIGHT

Copyright (C) 1991-2018 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;