PT-FIFO-SPLIT(1p)					User Contributed Perl Documentation					 PT-FIFO-SPLIT(1p)

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

       The following section is included to inform users about the potential risks, whether known or unknown, of using this tool.  The two main
       categories of risks are those created by the nature of the tool (e.g. read-only tools vs. read-write tools) and those created by bugs.

       pt-fifo-split creates and/or deletes the "--fifo" file.	Otherwise, no other files are modified, and it merely reads lines from the file
       given on the command-line.  It should be very low-risk.

       At the time of this release, we know of no bugs that could cause serious harm to users.

       The authoritative source for updated information is always the online issue tracking system.  Issues that affect this tool will be marked
       as such.  You can see a list of such issues at the following URL: http://www.percona.com/bugs/pt-fifo-split
       <http://www.percona.com/bugs/pt-fifo-split>.

       See also "BUGS" for more information on filing bugs and getting help.

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 file contains the process ID of the script.	The PID file is removed when the script exits.	Before
	   starting, the script checks if the PID file already exists.	If it does not, then the script creates and writes its own PID to it.  If
	   it does, then the script checks the following: if the file contains a PID and a process is running with that PID, then the script dies;
	   or, if there is no process running with that PID, then the script overwrites the file with its own PID and starts; else, if the file
	   contains no PID, then the script dies.

       --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 <http://www.percona.com/bugs/pt-fifo-split>.

       Please report bugs at https://bugs.launchpad.net/percona-toolkit <https://bugs.launchpad.net/percona-toolkit>.  Include the following
       information in your bug report:

       o   Complete command-line used to run the tool

       o   Tool "--version"

       o   MySQL version of all servers involved

       o   Output from the tool including STDERR

       o   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/ <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 developed by Percona for MySQL support and consulting.
       Percona Toolkit was forked from two projects in June, 2011: Maatkit and Aspersa.  Those projects were created by Baron Schwartz and
       developed primarily by him and Daniel Nichter, both of whom are employed by Percona.  Visit <http://www.percona.com/software/> for more
       software developed by Percona.

COPYRIGHT, LICENSE, AND WARRANTY
       This program is copyright 2007-2011 Baron Schwartz, 2011-2012 Percona Inc.  Feedback and improvements are welcome.

       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 2.1.2

perl v5.14.2							    2012-06-15							 PT-FIFO-SPLIT(1p)