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 3.1.0