[](https://travis-ci.org/Corion/App-part)
[](https://ci.appveyor.com/project/Corion/App-part)
# 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`)
