Steven Haryanto

NAME

Data::Unixish::head - Output the first items of data

VERSION

version 1.32

SYNOPSIS

In Perl:

 use Data::Unixish::head;
 my @res;
 @res = dux("head", 1..100); # => (1..10)
 @res = dux([head => {items=>3}], 1..100); # => (1, 2, 3)

In command line:

 % seq 1 100 | dux head -n 20 | dux tail --format=text-simple -n 5
 16
 17
 18
 19
 20

AUTHOR

Steven Haryanto <stevenharyanto@gmail.com>

COPYRIGHT AND LICENSE

This software is copyright (c) 2013 by Steven Haryanto.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

DESCRIPTION

FUNCTIONS

None are exported by default, but they are exportable.

head(%args) -> [status, msg, result, meta]

Output the first items of data.

Arguments ('*' denotes required arguments):

  • in => any

    Input stream (e.g. array or filehandle).

  • items => int (default: 10)

    Number of items to output.

  • out => any

    Output stream (e.g. array or filehandle).

Return value:

Returns an enveloped result (an array). First element (status) is an integer containing HTTP status code (200 means OK, 4xx caller error, 5xx function error). Second element (msg) is a string containing error message, or 'OK' if status is 200. Third element (result) is optional, the actual result. Fourth element (meta) is called result metadata and is optional, a hash that contains extra information.