dbcolcopylast - create new columns that are copies of prior columns

NOTE: this page was directly converted from the perl FSDB manual pages from FSDB version 3.1

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 -

SEE ALSO

Fsdb.