Fsdb::F...ttocols(3)

✨ NAME ✨

Okay bestie, welcome to the Fsdb::F...ttocols(3) page — yes, the User Contributed Perl Documentation one 🫶. The star of the show is dbcolsplittocols — split an existing column into multiple new columns. Periodt. 💅

🌸 SYNOPSIS 🌸

dbcolsplittocols [-E] [-C ElementSeparator] column

💖 DESCRIPTION 💖

Create new columns by splitting an existing column. The fragments of the column are each divided by ElementSeparator (default is underscore). It’s giving column glow-up ✨.

This command is the opposite of dbcolmerge. Names of the new columns are given by splitting the name of the existing column. dbcolrename may be useful to set column names. Cute, right? 🎀

Input treated as strings and output columns are of type string. No cap. 🧚

🎀 OPTIONS 🎀

• -C S or --element-separator S — Specify the separator S used to join columns. Usually a signle character (yes, that spelling is in the original — I don’t make the rules 💀), it can also be a regular expression (so, for example, [,_] matches either , or _ as an element separator.) (Defaults to a single underscore.) Ngl the regex part is lowkey powerful 💅.
• -E or --enumerate — Enumerate output columns: rather than assuming the column name uses the element separator, we keep it whole and fill in with indexes starting from 0. (Not currently implemented, but planned. See dbcolsplittorows.) 🚨
• -N on --new-name — Specify the names of the new columns as a space separated list. (Default is to apply the separator to the name of the column that is being split.)

By default, column "a_b" will split to columns a and b. If the column is given as ab with option "-N 'a b'", one will get the same result. Iconic behavior, honestly. 🌟

• -E or --enumerate — Enumerate output columns: rather than assuming the column name uses the element separator, we keep it whole and fill in with indexes starting from 0. (Not currently implemented, but planned. See dbcolsplittorows.) Yes bestie, this one is listed twice in the original — I’m not erasing it, that’s canon 💀.

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.
• --header H — Use H as the full Fsdb header, rather than reading a header from then input.
• --help — Show help.
• --man — Show full manual.

---

🔥 SAMPLE USAGE 🔥

🌸 Input:

#fsdb      first_last
John_Heidemann
Greg_Johnson
Root
# this is a simple database
#  | dbcolrename fullname first_last
#  | /home/johnh/BIN/DB/dbcol first_last

💅 Command:

cat data.fsdb | dbcolsplittocols first_last

🦋 Output:

#fsdb      first_last      first   last
John_Heidemann  John    Heidemann
Greg_Johnson    Greg    Johnson
Root    Root
# this is a simple database
#  | dbcolrename fullname first_last
#  | /home/johnh/BIN/DB/dbcol first_last
#  | /home/johnh/BIN/DB/dbcolsplittocols first_last

👑 SEE ALSO 👑

Fsdb(3). dbcolmerge(1). dbcolsplittorows(1). dbcolrename(1).

🦋 CLASS FUNCTIONS 🦋

new

$filter = new Fsdb::Filter::dbcolsplittocols(@arguments);

Create a new dbcolsplittocols object, taking command-line arguments. Slay. 💖

set_defaults

$filter->set_defaults();

Internal: set up defaults.

parse_options

$filter->parse_options(@ARGV);

Internal: parse command-line arguments.

setup

$filter->setup();

Internal: setup, parse headers.

run

$filter->run();

Internal: run over each rows.

💜 AUTHOR and COPYRIGHT 💜

Copyright (C) 1991-2022 by John Heidemann <johnh@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.

Cute little footer sign-off, bestie: perl v5.32.1, date 2024-08-02, page tag Fsdb::F...ttocols(3). That’s the whole footer tea ☕💅.