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PROGRAM:

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.

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