dbcolcopylast (1) - Linux Manuals

dbcolcopylast: create new columns that are copies of prior columns

NAME

dbcolcopylast - create new columns that are copies of prior columns

SYNOPSIS

    dbcolcopylast [-e EMPTY] [column...]

DESCRIPTION

For each COLUMN, create a new column copylast_COLUMN that is the last value for that column---that is, the value of that column from the row before.

OPTIONS

-e EmptyValue or --empty

Specify the value newly created columns get.

This module also supports the standard fsdb options:

-d

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.

--help

Show help.

--man

Show full manual.

SAMPLE USAGE

Input:

    #fsdb test
    a
    b

Command:

    cat data.fsdb | dbcolcopylast foo

Output:

    #fsdb      test    foo
    a       -
    b       -

AUTHOR and COPYRIGHT

Copyright (C) 1991-2015 by John Heidemann <johnh [at] isi.edu>

This program is distributed under terms of the GNU general public license, version 2. See the file COPYING with the distribution for details.