1Fsdb::Filter::dbrow(3)User Contributed Perl DocumentationFsdb::Filter::dbrow(3)
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NAME

6       dbrow - select rows from an Fsdb file based on arbitrary conditions
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SYNOPSIS

9       dbrow [-vw] CONDITION [CONDITION...]
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DESCRIPTION

12       Select rows for which all CONDITIONS are true.  Conditions are
13       specified as Perl code, in which column names are be embedded, preceded
14       by underscores.
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OPTIONS

17       -v  Invert the selection, picking rows where at least one condition
18           does not match.
19
20       This module also supports the standard fsdb options:
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22       -d  Enable debugging output.
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24       -w or --warnings
25           Enable warnings in user supplied code.
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27       -i or --input InputSource
28           Read from InputSource, typically a file name, or "-" for standard
29           input, or (if in Perl) a IO::Handle, Fsdb::IO or Fsdb::BoundedQueue
30           objects.
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32       -o or --output OutputDestination
33           Write to OutputDestination, typically a file name, or "-" for
34           standard output, or (if in Perl) a IO::Handle, Fsdb::IO or
35           Fsdb::BoundedQueue objects.
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37       --autorun or --noautorun
38           By default, programs process automatically, but Fsdb::Filter
39           objects in Perl do not run until you invoke the run() method.  The
40           "--(no)autorun" option controls that behavior within Perl.
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42       --header H
43           Use H as the full Fsdb header, rather than reading a header from
44           then input.
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46       --help
47           Show help.
48
49       --man
50           Show full manual.
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SAMPLE USAGE

53   Input:
54           #fsdb account passwd uid gid fullname homedir shell
55           johnh * 2274 134 John_Heidemann /home/johnh /bin/bash
56           greg * 2275 134 Greg_Johnson /home/greg /bin/bash
57           root * 0 0 Root /root /bin/bash
58           # this is a simple database
59
60   Command:
61           cat DATA/passwd.fsdb | dbrow '_fullname =~ /John/'
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63   Output:
64           #fsdb      account passwd  uid     gid     fullname        homedir shell
65           johnh   *       2274    134     John_Heidemann  /home/johnh     /bin/bash
66           greg    *       2275    134     Greg_Johnson    /home/greg      /bin/bash
67           # this is a simple database
68           #  | /home/johnh/BIN/DB/dbrow
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BUGS

71       Doesn't detect references to unknown columns in conditions.
72
73       END
74           #' for font-lock mode.
75           exit 1;
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CLASS FUNCTIONS

78   new
79           $filter = new Fsdb::Filter::dbrow(@arguments);
80
81       Create a new dbrow object, taking command-line arguments.
82
83   set_defaults
84           $filter->set_defaults();
85
86       Internal: set up defaults.
87
88   parse_options
89           $filter->parse_options(@ARGV);
90
91       Internal: parse command-line arguments.
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93   setup
94           $filter->setup();
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96       Internal: setup, parse headers.
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98   run
99           $filter->run();
100
101       Internal: run over each rows.
102

104       Copyright (C) 1991-2018 by John Heidemann <johnh@isi.edu>
105
106       This program is distributed under terms of the GNU general public
107       license, version 2.  See the file COPYING with the distribution for
108       details.
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112perl v5.34.1                      2022-04-04            Fsdb::Filter::dbrow(3)
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