NAME
App::PipeFilter
VERSION
version 0.004
DESCRIPTION
App::PipeFilter is a distribution of shell pipeline filters designed to work with structured data like JSON rather than whitespace separated fields.
For example, jcut is a simple version of cut(1) that understands JSON objects rather than whitespace separated fields.
% head -1 sample.json
{"network":"freenode","channel":"#perl","nick":"dngor","karma":"120"}
% jcut -o network -o channel < eg/sample.json | sort | uniq
{"network":"efnet","channel":"#perl"}
{"network":"efnet","channel":"#poe"}
{"network":"efnet","channel":"#reflex"}
{"network":"freenode","channel":"#perl"}
{"network":"freenode","channel":"#poe"}
{"network":"freenode","channel":"#reflex"}
{"network":"magnet","channel":"#perl"}
{"network":"magnet","channel":"#poe"}
{"network":"magnet","channel":"#reflex"}The jsonpath filter supports more complex expressions using JSON::Path's variant of JSONPath.
curl -s 'http://api.duckduckgo.com/?q=poe&o=json' |
jsonpath -o '$..Topics.*.FirstURL' -o '$..Topics.*.Text' |
grep -i perl |
jmap -i col0 -o url -i col1 -o title |
json2yaml
---
title: Perl Object Environment, a library for event driven multitasking for the Perl programming language
url: http://duckduckgo.com/Perl_Object_EnvironmentDESIGN GOAL
App::PipeFilter utilities generally follow the UNIX convention of printing one record per line of text. This maximizes compatibility with UNIX utilities like sort(1), uniq(1) and grep(1).
PRO TIPS
JSON isn't particularly concise, so put grep(1), jcut(1) and other filters that eliminate data as early as possible in pipelines.
SEE ALSO
jcat - concatenate and print JSON files
jcut - cut out selected portions of each JSON object in a file
jmap - map input JSON fields to output JSON fields by renaming them
json2yaml - convert files of JSON objects into a stream of YAML objects
jsonpath - use JSON::Path to cut out selected portions of JSON objects
jsort - sort input files of JSON objects on key fields
mysql2json - convert mysql -B output to JSON object streams
http://search.cpan.org/perldoc?JSON::Path
http://goessner.net/articles/JsonPath/
BUGS
https://rt.cpan.org/Public/Dist/Display.html?Name=App-PipeFilter
REPOSITORY
https://github.com/rcaputo/app-pipefilter
COPYRIGHT and LICENSE
App::PipeFilter is Copyright 2011 by Rocco Caputo. All rights are reserved. App::PipeFilter is released under the same terms as Perl itself.