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

        # 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

    --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

    --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

    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

    The public repository of this program is

    The public support forum of this program is http://perlmonks.org/. The
    homepage is http://perlmonks.org/?node_id=598718 .

    Please report bugs via http://perlmonks.org.

    Copyright (c) 2007-2011 Max Maischein (`corion@cpan.org')