nxfilter
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A command line tool for filtering RDF N-Triples or N-Quads
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# nxfilter
A command line tool for filtering RDF N-Triples or N-Quads.
[](https://www.npmjs.com/package/nxfilter)   [](https://travis-ci.org/j13z/nxfilter/builds)
## Usage
`nxfilter` lets you:
- Use N-Triples / N-Quads in a Unix pipe to run small ad-hoc queries:
```shell
curl -s http://dbpedia.org/data/Munich.ntriples | \
nxfilter -p | sort | uniq -c | sort -n -r | head
```
- Look at data files more conveniently in the terminal:
Like `cut` for N-x formats, plus some additional query features.
You can filter by:
- Element position (`-s`, `-p`, `-o`, `-g`)
- Type: `--<element>:<type>` (with types `iri` / `bnode` / `literal`)
- Value: `--<element>=<value>`
Run `nxfilter --help` for [detailed usage information](doc/cli/usage.txt).
[Settings](bin/defaults.json) (colors and defaults) can be adjusted with a dotfile: `~/.nxfilterrc`.
## Examples
Get predicates and objects as TSV:
nxfilter -p -o --delimiter '\t' data.nt.gz
Get most frequent predicates (pipe):
cat data.nt | nxfilter -p | sort | uniq -c | sort -n -r | head
Output _(predicate, object)_ tuples where the object is a literal:
nxfilter --predicate --object:literal data.nt.g
## Installation
Requires [Node.js](http://nodejs.org/) (which is easy to install). With Node.js installed, get it via npm with
$ npm install -g nxfilter
which provides you with the `nxfilter` command on your shell, installed in user space.
## Change Log
- **1.0.6:** Fixes `nxfilter -h` bug