dbfilecat man page

dbfilecat — concatenate two files with identical schema


    dbfilecat --input A.fsdb [--input B.fsdb...]


    echo A.fsdb | dbfilecat --xargs


Concatenate all provided input files, producing one result. We remove extra header lines.

Inputs can both be specified with "--input", or one can come from standard input and the other from "--input". With "--xargs", each line of standard input is a filename for input.

Inputs must have identical schemas (columns, column order, and field separators).

Like dbmerge, but no worries about sorting, and with no arguments we read standard input (although that's not very useful).


General option:


Expect that input filenames are given, one-per-line, on standard input. (In this case, merging can start incrementally.


Delete the source files after they have been consumed. (Defaults off, leaving the inputs in place.)

This module also supports the standard fsdb options:


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.


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Sample Usage


File a.fsdb:

    #fsdb cid cname
    11 numanal
    10 pascal

File b.fsdb:

    #fsdb cid cname
    12 os
    13 statistics


    dbfilecat --input a.fsdb --input b.fsdb


    #fsdb      cid     cname
    11 numanal
    10 pascal
    12 os
    13 statistics
    #  | dbmerge --input a.fsdb --input b.fsdb

See Also

dbmerge(1), Fsdb(3)


2016-01-04 perl v5.26.0 User Contributed Perl Documentation