#  Copyright (C) 2007  Stanislav Sinyagin
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program; if not, write to the Free Software
#  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.

# Stanislav Sinyagin <ssinyagin@yahoo.com>
#
#

=head1 NAME

srvderive - Derive a new service ID from sum or maximum of other service values

=head1 SYNOPSIS

B<torrus srvderive> I<TIMESPAN> I<OUTPUT> I<FUNCTION> I<SOURCES>...

=head1 DESCRIPTION

When the Torrus Reporting engine is set up, this command is used
to combine several services data into a new service ID. The output data
is either the maximum or the sum of input services.

See I<Torrus Reporting Setup Guide> for more information.

=head1 TIMESPAN

Either --month or --end option must be defined

=over 4

=item B<--start>=I<YYYY-MM-DD>

Sets the start date of the calculation.

=item B<--end>=I<YYYY-MM-DD>

Sets the next day after the eond of the period.

=item B<--month>

Instead of setting the end data, it is convenient to use this option. It sets
the end data in one calendar month after the start date.

=back


=head1 OUTPUT

=over 4

=item B<--out>=I<SERVICEID>

Sets the output service ID. This should not be a service ID used in the
Torrus datasource trees. B<Note:> if I<srvderive> command is run twice
with the same arguments, the produced data is doubled for the output
service ID.

=back



=head1 FUNCTION

=over 4

=item B<--func>=C<MAX>|C<SUM>

Sets the function to be used when combining the input service data.
Currently only C<MAX> and C<SUM> are supportted.

=back


=head1 SOURCES

=over 4

=item B<--in>=I<SERVICEID> ...

Input service IDs are specified either by B<--in> option, or as command line
arguments. At least 2 input service IDs should be specified.

=back



=head1 OPTIONS

=over 4

=item B<--step>

Default: 300. Sets the data interval for derived service ID. It is recommended
to leave this option at default value.

=item B<--verbose>

Prints extra informatgion.

=item B<--debug>

Prints debugging information.

=item B<--help>

Prints command usage information.

=back



=head1 SEE ALSO

L<torrus(@mansec_usercmd@)>

=head1 NOTES

See more documentation at Torrus home page: http://torrus.org

=head1 AUTHOR

Stanislav Sinyagin E<lt>ssinyagin@yahoo.comE<gt>

