1Fsdb::Filter::dbcolmergUes(e3r)Contributed Perl DocumentFastdibo:n:Filter::dbcolmerge(3)
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NAME

6       dbcolmerge - merge multiple columns into one
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SYNOPSIS

9       dbcolmerge [-C ElementSeparator] [columns...]
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DESCRIPTION

12       For each row, merge multiple columns down to a single column (always a
13       string), joining elements with ElementSeparator (defaults to a single
14       underscore).
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OPTIONS

17       -C S or --element-separator S
18           Specify the separator used to join columns.  (Defaults to a single
19           underscore.)
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21       -e E or --empty E
22           give value E as the value for empty (null) records
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24       This module also supports the standard fsdb options:
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26       -d  Enable debugging output.
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28       -i or --input InputSource
29           Read from InputSource, typically a file name, or "-" for standard
30           input, or (if in Perl) a IO::Handle, Fsdb::IO or Fsdb::BoundedQueue
31           objects.
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33       -o or --output OutputDestination
34           Write to OutputDestination, typically a file name, or "-" for
35           standard output, or (if in Perl) a IO::Handle, Fsdb::IO or
36           Fsdb::BoundedQueue objects.
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38       --autorun or --noautorun
39           By default, programs process automatically, but Fsdb::Filter
40           objects in Perl do not run until you invoke the run() method.  The
41           "--(no)autorun" option controls that behavior within Perl.
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43       --header H
44           Use H as the full Fsdb header, rather than reading a header from
45           then input.
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47       --help
48           Show help.
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50       --man
51           Show full manual.
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SAMPLE USAGE

54   Input:
55           #fsdb      first   last
56           John    Heidemann
57           Greg    Johnson
58           Root    -
59           # this is a simple database
60           #  | /home/johnh/BIN/DB/dbcol fullname
61           #  | dbcolrename fullname first_last
62           #  | /home/johnh/BIN/DB/dbcolsplit -C _ first_last
63           #  | /home/johnh/BIN/DB/dbcol first last
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65   Command:
66           cat data.fsdb | dbcolmerge -C _ first last
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68   Output:
69           #fsdb      first   last    first_last
70           John    Heidemann       John_Heidemann
71           Greg    Johnson Greg_Johnson
72           Root    -        Root_
73           # this is a simple database
74           #  | /home/johnh/BIN/DB/dbcol fullname
75           #  | dbcolrename fullname first_last
76           #  | /home/johnh/BIN/DB/dbcolsplit first_last
77           #  | /home/johnh/BIN/DB/dbcol first last
78           #  | /home/johnh/BIN/DB/dbcolmerge -C _ first last
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SEE ALSO

81       Fsdb.  dbcolsplittocols.  dbcolsplittorows.  dbcolrename.
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CLASS FUNCTIONS

84   new
85           $filter = new Fsdb::Filter::dbcolmerge(@arguments);
86
87       Create a new dbcolmerge object, taking command-line arguments.
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89   set_defaults
90           $filter->set_defaults();
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92       Internal: set up defaults.
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94   parse_options
95           $filter->parse_options(@ARGV);
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97       Internal: parse command-line arguments.
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99   setup
100           $filter->setup();
101
102       Internal: setup, parse headers.
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104   run
105           $filter->run();
106
107       Internal: run over each rows.
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110       Copyright (C) 1991-2022 by John Heidemann <johnh@isi.edu>
111
112       This program is distributed under terms of the GNU general public
113       license, version 2.  See the file COPYING with the distribution for
114       details.
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118perl v5.36.0                      2023-01-20       Fsdb::Filter::dbcolmerge(3)
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