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# NAME

part - split up a single input file into multiple files according to a column value

# SYNOPSIS

    # Split a comma separated file according to the third column
    # keeping and reproducing one line of headers
    perl -w part.pl example.csv --header-line=1 --column=3 "--separator=,"

    # Split a tab separated file according to the second column
    perl -w part.pl example.tsv --column=2 --separator=009

# OPTIONS

- **--out** - set the output template

    If the output template is not given it is guessed from
    the name of the first input file or set to `part-%s.txt`.
    The `%s` will be replaced by the column value.

- **--column** - set the column to part on

    This is the zero-based number of the column.
    Multiple columns may be given.

- **--separator** - set the column separator

    This is the separator for the columns. It defaults
    to a tab character ("\\t").

- **--header-line** - output the first line into every file

    This defines the line as header line which is output
    into every file. If it is given an argument that string
    is output as header, otherwise the first line read
    will be repeated as the header.

    If the value is a number, that many lines will be read from
    the file and used as the header. This makes it impossible
    to use just a number as the header.

- **--verbose** - output the generated filenames

    In normal operation, the program will be silent. If you
    need to know the generated filenames, the `--verbose`
    option will output them.

- **--filename-sep** - set the separator for the filenames

    If you prefer a different separator for the filenames
    than a newline, this option allows you to set it. If
    the separator looks like an octal number (three digits)
    it is interpreted as such. Otherwise it will
    be taken literally. A common
    use is to set the separator to `000` to separate the
    files by the zero character if you suspect that your
    filenames might contain newlines.

    It defaults to `012`, a newline.

- **--version** - output version information

# CAVEAT

The program loads the whole input into RAM
before writing the output. A future enhancement
might be a `uniq`-like option that tells the
program to assume that the input will be grouped
according to the parted column so it does not
need to allocate memory.

If your memory is not large enough, the following
`awk` one-liner might help you:

    # Example of parting on column 3
    awk -F '{ print $0 > $3 }' FILE

# REPOSITORY

The public repository of this program is
[https://github.com/Corion/app-part](https://github.com/Corion/app-part).

# SUPPORT

The public support forum of this program is
[https://perlmonks.org/](https://perlmonks.org/). The homepage is
[https://perlmonks.org/?node\_id=598718](https://perlmonks.org/?node_id=598718) .

# BUG TRACKER

Please report bugs via [https://perlmonks.org](https://perlmonks.org).

# AUTHOR

Copyright (c) 2007-2019 Max Maischein (`corion@cpan.org`)