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