1DBMERGE2(1)           User Contributed Perl Documentation          DBMERGE2(1)
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NAME

6       dbmerge2 - merge exactly two inputs in sorted order based on the the
7       specified columns
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SYNOPSIS

10           dbmerge2 --input A.fsdb --input B.fsdb [-T TemporaryDirectory] [-nNrR] column [column...]
11
12       or
13           cat A.fsdb | dbmerge2 --input B.fsdb [-T TemporaryDirectory]
14       [-nNrR] column [column...]
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DESCRIPTION

17       Merge exactly two sorted input files, producing one sorted result.
18       Inputs can both be specified with "--input", or one can come from
19       standard input and the other from "--input".
20
21       Inputs must have identical schemas (columns, column order, and field
22       separators).
23
24       Dbmerge2 consumes a fixed amount of memory regardless of input size.
25
26       Although described above as a command line too, the command line
27       version of dbmerge2 is not installed by default.  Dbmerge2 is used
28       primarily internal to perl; dbmerge(1) is the command-line tool for
29       user use.
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31       Warning: we do not verify that each input is actually sorted.  In
32       correct merge results will occur if they are not.
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OPTIONS

35       General option:
36
37       --saveoutput $OUT_REF
38           Save output writer (for integration with other fsdb filters).
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40       <-T TmpDir>
41           where to put tmp files.  Also uses environment variable TMPDIR, if
42           -T is not specified.  Default is /tmp.
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44       Sort specification options (can be interspersed with column names):
45
46       -r or --descending
47           sort in reverse order (high to low)
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49       -R or --ascending
50           sort in normal order (low to high)
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52       -n or --numeric
53           sort numerically
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55       -N or --lexical
56           sort lexicographically
57
58       This module also supports the standard fsdb options:
59
60       -d  Enable debugging output.
61
62       -i or --input InputSource
63           Read from InputSource, typically a file name, or "-" for standard
64           input, or (if in Perl) a IO::Handle, Fsdb::IO or Fsdb::BoundedQueue
65           objects.
66
67       -o or --output OutputDestination
68           Write to OutputDestination, typically a file name, or "-" for
69           standard output, or (if in Perl) a IO::Handle, Fsdb::IO or
70           Fsdb::BoundedQueue objects.
71
72       --autorun or --noautorun
73           By default, programs process automatically, but Fsdb::Filter
74           objects in Perl do not run until you invoke the run() method.  The
75           "--(no)autorun" option controls that behavior within Perl.
76
77       --header H
78           Use H as the full Fsdb header, rather than reading a header from
79           then input.
80
81       --help
82           Show help.
83
84       --man
85           Show full manual.
86

SAMPLE USAGE

88   Input:
89       File a.fsdb:
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91           #fsdb cid cname
92           11 numanal
93           10 pascal
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95       File b.fsdb:
96
97           #fsdb cid cname
98           12 os
99           13 statistics
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101   Command:
102           dbmerge2 --input a.fsdb --input b.fsdb cname
103
104       or
105
106           cat a.fsdb | dbmerge2 --input b.fsdb cname
107
108   Output:
109           #fsdb      cid     cname
110           11 numanal
111           12 os
112           10 pascal
113           13 statistics
114           #  | dbmerge2 --input a.fsdb --input b.fsdb cname
115

SEE ALSO

117       dbmerge(1), dbsort(1), Fsdb(3)
118

120       Copyright (C) 1991-2019 by John Heidemann <johnh@isi.edu>
121
122       This program is distributed under terms of the GNU general public
123       license, version 2.  See the file COPYING with the distribution for
124       details.
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128perl v5.34.0                      2021-07-22                       DBMERGE2(1)
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