1Fsdb::Filter::dbcolcreaUtsee(r3)Contributed Perl DocumenFtsadtbi:o:nFilter::dbcolcreate(3)
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6 dbcolcreate - create new columns
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9 dbcolcreate NewColumn1 [NewColumn2]
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11 or
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13 dbcolcreate -e DefaultValue NewColumnWithDefault
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16 Create columns "NewColumn1", etc. with an optional "DefaultValue".
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19 -e EmptyValue or --empty
20 Specify the value newly created columns get.
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22 -f or --first
23 Put all new columns as the first columns of each row. By default,
24 they go at the end of each row.
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26 --no-recreate-fatal
27 By default, creating an existing column is an error. With
28 --no-recreate-fatal, we ignore re-creation.
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30 This module also supports the standard fsdb options:
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32 -d Enable debugging output.
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34 -i or --input InputSource
35 Read from InputSource, typically a file name, or "-" for standard
36 input, or (if in Perl) a IO::Handle, Fsdb::IO or Fsdb::BoundedQueue
37 objects.
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39 -o or --output OutputDestination
40 Write to OutputDestination, typically a file name, or "-" for
41 standard output, or (if in Perl) a IO::Handle, Fsdb::IO or
42 Fsdb::BoundedQueue objects.
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44 --autorun or --noautorun
45 By default, programs process automatically, but Fsdb::Filter
46 objects in Perl do not run until you invoke the run() method. The
47 "--(no)autorun" option controls that behavior within Perl.
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49 --header H
50 Use H as the full Fsdb header, rather than reading a header from
51 then input.
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53 --help
54 Show help.
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56 --man
57 Show full manual.
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60 Input:
61 #fsdb test
62 a
63 b
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65 Command:
66 cat data.fsdb | dbcolcreate foo
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68 Output:
69 #fsdb test foo
70 a -
71 b -
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74 Fsdb.
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77 new
78 $filter = new Fsdb::Filter::dbcolcreate(@arguments);
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80 Create a new dbcolcreate object, taking command-line arguments.
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82 set_defaults
83 $filter->set_defaults();
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85 Internal: set up defaults.
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87 parse_options
88 $filter->parse_options(@ARGV);
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90 Internal: parse command-line arguments.
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92 setup
93 $filter->setup();
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95 Internal: setup, parse headers.
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97 run
98 $filter->run();
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100 Internal: run over each rows.
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103 Copyright (C) 1991-2022 by John Heidemann <johnh@isi.edu>
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105 This program is distributed under terms of the GNU general public
106 license, version 2. See the file COPYING with the distribution for
107 details.
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111perl v5.36.0 2022-11-22 Fsdb::Filter::dbcolcreate(3)