Provided by: percona-toolkit_3.2.1-1_all 
NAME
pt-fifo-split - Split files and pipe lines to a fifo without really splitting.
SYNOPSIS
Usage: pt-fifo-split [OPTIONS] [FILE]
pt-fifo-split splits FILE and pipes lines to a fifo. With no FILE, or when FILE is -, read standard
input.
Read hugefile.txt in chunks of a million lines without physically splitting it:
pt-fifo-split --lines 1000000 hugefile.txt
while [ -e /tmp/pt-fifo-split ]; do cat /tmp/pt-fifo-split; done
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:
• Read the tool's documentation
• Review the tool's known "BUGS"
• Test the tool on a non-production server
• Backup your production server and verify the backups
DESCRIPTION
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.
--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.
SYSTEM REQUIREMENTS
You need Perl, DBI, DBD::mysql, and some core packages that ought to be installed in any reasonably new
version of Perl.
BUGS
For a list of known bugs, see <http://www.percona.com/bugs/pt-fifo-split>.
Please report bugs at <https://jira.percona.com/projects/PT>. Include the following information in your
bug report:
• Complete command-line used to run the tool
• Tool "--version"
• MySQL version of all servers involved
• Output from the tool including STDERR
• Input files (log/dump/config files, etc.)
If possible, include debugging output by running the tool with "PTDEBUG"; see "ENVIRONMENT".
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.
AUTHORS
Baron Schwartz
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 2011-2018 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 along with this program; if not, write
to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
VERSION
pt-fifo-split 3.2.1
perl v5.30.3 2020-08-30 PT-FIFO-SPLIT(1p)