dbcolcopylast - create new columns that are copies of prior columns
======================================================================

*NOTE: this page was directly converted from the perl FSDB manual pages from FSDB version 3.1*

SYNOPSIS
--------

dbcolcopylast [-e EMPTY] [column...]

DESCRIPTION
-----------

For each COLUMN, create a new column copylast_COLUMN that is the last
value for that column---that is, the value of that column from the row
before.

OPTIONS
-------

-e EmptyValue or --empty
   Specify the value newly created columns get.

This module also supports the standard fsdb options:

-d
   Enable debugging output.

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

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

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

--help
   Show help.

--man
   Show full manual.

SAMPLE USAGE
------------

Input:
------

#fsdb test a b

Command:
--------

cat data.fsdb \| dbcolcopylast foo

Output:
-------

#fsdb test foo a - b -

SEE ALSO
--------

Fsdb.

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.