pt-fifo-split1p

Usage

Risks

Percona Toolkit is mature, proven in the real world, and well tested, but all database tools can pose a risk to the system and the database server. Before using this tool, please:

Overview

pt-fifo-split lets you read from a file as though it contains only some of the lines in the file. When you read from it again, it contains the next set of lines; when you have gone all the way through it, the file disappears. This works only on Unix-like operating systems.

You can specify multiple files on the command line. If you don't specify any, or if you use the special filename "-", lines are read from standard input.

Options

This tool accepts additional command-line arguments. Refer to the "SYNOPSIS" and usage information for details.

--[no]buffer-stdout

default: yes

Enables STDOUT buffering. Disable this option if you want to see live progress when using output post-processing tools such as "tee" or "kubectl logs".

--config

type: Array

Read this comma-separated list of config files; if specified, this must be the first option on the command line.

--fifo

type: string; default: /tmp/pt-fifo-split

The name of the fifo from which the lines can be read.

--force

Remove the fifo if it exists already, then create it again.

--help

Show help and exit.

--lines

type: int; default: 1000

The number of lines to read in each chunk.

--offset

type: int; default: 0

Begin at the Nth line. If the argument is 0, all lines are printed to the fifo. If 1, then beginning at the first line, lines are printed (exactly the same as 0). If 2, the first line is skipped, and the 2nd and subsequent lines are printed to the fifo.

--pid

type: string

Create the given PID file. The tool won't start if the PID file already exists and the PID it contains is different than the current PID. However, if the PID file exists and the PID it contains is no longer running, the tool will overwrite the PID file with the current PID. The PID file is removed automatically when the tool exits.

--statistics

Print out statistics between chunks. The statistics are the number of chunks, the number of lines, elapsed time, and lines per second overall and during the last chunk.

--version

Show version and exit.

Environment

The environment variable "PTDEBUG" enables verbose debugging output to STDERR. To enable debugging and capture all output to a file, run the tool like:

   PTDEBUG=1 pt-fifo-split ... > FILE 2>&1

Be careful: debugging output is voluminous and can generate several megabytes of output.

Attention

Using <PTDEBUG> might expose passwords. When debug is enabled, all command line parameters are shown in the output.

System requirements

You need Perl, DBI, DBD::mysql, and some core packages that ought to be installed in any reasonably new version of Perl.

Downloading

Visit <http://www.percona.com/software/percona-toolkit/> to download the latest release of Percona Toolkit. Or, get the latest release from the command line:

   wget percona.com/get/percona-toolkit.tar.gz
   wget percona.com/get/percona-toolkit.rpm
   wget percona.com/get/percona-toolkit.deb

You can also get individual tools from the latest release:

   wget percona.com/get/TOOL

Replace "TOOL" with the name of any tool.

About percona toolkit

This tool is part of Percona Toolkit, a collection of advanced command-line tools for MySQL developed by Percona. Percona Toolkit was forked from two projects in June, 2011: Maatkit and Aspersa. Those projects were created by Baron Schwartz and primarily developed by him and Daniel Nichter. Visit <http://www.percona.com/software/> to learn about other free, open-source software from Percona.

Copyright, license, and warranty

This program is copyright 2011-2026 Percona LLC and/or its affiliates, 2007-2011 Baron Schwartz.

THIS PROGRAM IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2; OR the Perl Artistic License. On UNIX and similar systems, you can issue `man perlgpl' or `man perlartistic' to read these licenses.

You should have received a copy of the GNU General Public License, version 2 along with this program; if not, see <https://www.gnu.org/licenses/>.

Version

pt-fifo-split 3.7.1-4