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Fsdb::Filter::dbcolcreate

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.

--header H

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

--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) 1991-2022 by John Heidemann <johnh AT isi DOT edu>

This program is distributed under terms of the GNU general public license, version 2. See the file COPYING with the distribution for details.

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