---
name: "trapper"
section: "1p"
platform: "linux"
package: "librdf-trineshortcuts-perl"
version: "0.104-1"
release: "Debian 7 (Wheezy)"
platforms: ["linux"]
url: "https://new.carta.tech/trapper"
---

# trapper(1p)

command-line RDF parsing and serialising tool

## NAME

trapper - command-line RDF parsing and serialising tool

## SYNOPSIS

```
  trapper [options] INPUT-URI [INPUT-BASE-URI]
  Options:
    --input F, -i F       Set the input format to F
    --input-uri U, -I U   Alternative to INPUT-BASE-URI
    --output F, -o F      Set the output format to F
    --count, -c           Count triples only
    --quiet, -q           No extra information messages
    --help, -h            Show this help
    --version, -v         Show module versions

  Input formats: rdfxml, n3, turtle, rdfa, nquads, trig, rdfjson, atom, xrd.

  Output formats: rdfxml, n3, turtle, ntriples, rdfa, nquads, rdfjson, canonical.
```

## OPTIONS

- **--input**, **-i**

  Specify the input format. The synopsis of this manual page shows a list of input formats. Using media types should work too. In summary, it accepts any type that the `"rdf_parse"` function from RDF::TrineShortcuts accepts.

  If an input type is not specified, trapper will try to guess the input type (and will almost always get it right).

- **--input-uri**, **-I**, **INPUT-BASE-URI**

  Any of these three methods can be used to specify a base URI for the parser to resolve relative URI references.

- **--output**, **-o**

  Specifies the output format. The synopsis of this manual page shows a list of input formats. Using media types should work too. In summary, it accepts any type that the `"rdf_string"` function from RDF::TrineShortcuts accepts.

  If an input type is not specified, 'ntriples' is assumed.

- **--count**, **-c**

  Suppresses the output of the data, and just shows a count of triples instead.

- **--quiet**, **-q**

  Hides useless debugging messages.

- **--help**, **-h**

  Shows a short help message.

- **--version**, **-v**

  Shows the version of various Perl modules used by trapper. trapper itself doesn't have a version number, but is distributed along with RDF::TrineShortcuts, so could be considered to have the same version number as that.

## SHEBANG!!

trapper can be used as a shebang line of a Turtle or N-Triples file. e.g.:

```
  #!/usr/local/bin/trapper OPTS: -i turtle -o rdfxml

  @prefix foaf: <http://xmlns.com/foaf/0.1/> .

  [] a foaf:Person ;
     foaf:name "Toby Inkster" .
```

Note that you need the "OPTS:" bit to pass command-line options. This is a workaround for a limitation in Linux's shebang handling.

## NOTE

When possible, trapper attempts to use the same command-line options as the 'rapper' tool that is distributed with libraptor. However, full compatibility with rapper is not a goal, and is certainly not guaranteed.

A trapper is a person who catches animals, usually for fur.

## AUTHOR

Toby Inkster, \<tobyink@cpan.org\>

## COPYRIGHT AND LICENCE

Copyright (C) 2010 by Toby Inkster

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8 or, at your option, any later version of Perl 5 you may have available.