dbcolcopylast (1) Linux Manual Page
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 –
See Also
Fsdb.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.