Fsdb::Filter::dbcolcreate(3)

NAME
dbcolcreate - create new columns

SYNOPSIS
    dbcolcreate NewColumn1 [NewColumn2]

or

    dbcolcreate -e DefaultValue NewColumnWithDefault

DESCRIPTION
Create columns "NewColumn1", etc. with an optional "DefaultValue".

OPTIONS

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

-f or --first
    Put all new columns as the first columns of each row. By default, they go at the end of each row.

--no-recreate-fatal
    By default, creating an existing column is an error. With --no-recreate-fatal, we ignore re-creation.

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 | dbcolcreate foo

  Output:
    #fsdb      test    foo
    a       -
    b       -

SEE ALSO
Fsdb.

CLASS FUNCTIONS

  new
    $filter = new Fsdb::Filter::dbcolcreate(@arguments);

Create a new dbcolcreate object, taking command-line arguments.

  set_defaults
    $filter->set_defaults();

Internal: set up defaults.

  parse_options
    $filter->parse_options(@ARGV);

Internal: parse command-line arguments.

  setup
    $filter->setup();

Internal: setup, parse headers.

  run
    $filter->run();

Internal: run over each rows.

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.