Open Semantic Search

https://opensemanticsearch.org/doc
Admin
Open Semantic Search is an open-source search engine platform with advanced features including fuzzy...
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### Switch to root user

Source: https://opensemanticsearch.org/doc/admin/install/desktop_search

Command to get full root access in the terminal.

```bash
su

```

--------------------------------

### Index files

Source: https://opensemanticsearch.org/doc/admin/install/search_server

Command to index files, for example, the documentation directory of Linux.

```bash
opensemanticsearch-index-dir */usr/share/doc*
```

--------------------------------

### Install Ubuntu packages

Source: https://opensemanticsearch.org/doc/admin/install/search_server

Command to install Open Semantic Search Server package and its dependencies on Ubuntu Linux.

```bash
sudo apt install ./open-semantic-search-server*.deb
```

--------------------------------

### Install Debian packages

Source: https://opensemanticsearch.org/doc/admin/install/search_server

Commands to install Open Semantic Search Server packages and their dependencies on Debian GNU/Linux.

```bash
su
dpkg --install open-semantic-search-server*.deb
apt-get -f install
```

--------------------------------

### Start Solr index service

Source: https://opensemanticsearch.org/doc/admin/cmd

Command to start the Solr index service.

```bash
service solr start
```

--------------------------------

### Set root password and install OpenSSH server

Source: https://opensemanticsearch.org/doc/admin/install/search_appliance

Commands to set a root password and install the OpenSSH server for remote access.

```bash
passwd root
apt-get install openssh-server
```

--------------------------------

### Access search interface

Source: https://opensemanticsearch.org/doc/admin/install/search_server

URL to access the search interface in a web browser.

```http
http://localhost/search
```

--------------------------------

### SPARQL Query Example

Source: https://opensemanticsearch.org/doc/datamanagement/opendata/wikidata

Example of a SPARQL query to retrieve labels and alternate labels from a triplestore, suitable for importing into Open Semantic Search.

```sparql
SELECT ?item ?itemLabel ?altLabel WHERE {
  ?item rdfs:label ?itemLabel .
  OPTIONAL { ?item skos:altLabel ?altLabel . }
  FILTER(LANG(?itemLabel) = "en")
}
```

--------------------------------

### Install Scantailor

Source: https://opensemanticsearch.org/doc/admin/config/ocr

Installs the Scantailor package on Debian-based systems.

```bash
apt-get install scantailor
```

--------------------------------

### Install Tesseract OCR

Source: https://opensemanticsearch.org/doc/admin/config/ocr

Installs the tesseract-ocr package on Debian-based systems.

```bash
apt-get install tesseract-ocr
```

--------------------------------

### Index a folder or files via command line tools

Source: https://opensemanticsearch.org/doc/admin/install/search_appliance

Example of using the command line tool to index documents on the virtual machine.

```bash
opensemanticsearch-index-dir */media/sf_documents/*
```

--------------------------------

### Index a folder or files via REST-API

Source: https://opensemanticsearch.org/doc/admin/install/search_appliance

Example of calling the REST-API to index documents in a shared folder.

```bash
http://search-vm.localdomain/search-apps/api/index-dir?uri=/media/sf_documents
```

--------------------------------

### Adding Additional Blacklists

Source: https://opensemanticsearch.org/doc/admin/config/blacklist

Examples of how to add additional blacklists for URLs, prefixes, suffixes, and regular expressions to the OpenSearch configuration.

```python
config['blacklist'].append('/etc/opensemanticsearch/blacklist/blacklist-url-anOwnList')
config['blacklist_prefix'].append('/etc/opensemanticsearch/blacklist/blacklist-url-prefix-anOwnList')
config['blacklist_suffix'].append('/etc/opensemanticsearch/blacklist/blacklist-url-suffix-anOwnList')
config['blacklist_regex'].append('/etc/opensemanticsearch/blacklist/blacklist-url-suffix-anOwnList')
```

--------------------------------

### Boolean Operators

Source: https://opensemanticsearch.org/doc/search/operators

Examples of using AND, OR, and NOT/(-) operators to combine search terms.

```text
search engine
search AND engine
search OR research
search -engine
search NOT engine
search AND NOT engine
```

--------------------------------

### Grouping with Parentheses

Source: https://opensemanticsearch.org/doc/search/operators

Example of using parentheses to group clauses and combine criteria with OR and AND operators.

```text
(search OR research) AND (engine OR software)
```

--------------------------------

### Command Line Indexing

Source: https://opensemanticsearch.org/doc/search

Starts a crawl of a directory to extract and index data for fast search and analysis.

```bash
start a crawl of the directory with the command line tool
```

--------------------------------

### Wildcard Searches

Source: https://opensemanticsearch.org/doc/search/operators

Examples of using '*' for multiple character wildcard searches and '?' for single character wildcard searches.

```text
corrupt*
*rupt
*rupt*
co*upt
te?t
```

--------------------------------

### Mapping RDF properties to Solr fields

Source: https://opensemanticsearch.org/doc/admin/config

Example configuration for mapping RDF metadata properties to Solr fields, including custom facets.

```python
config['meta_property2facet'] = {
  'http://purl.org/dc/terms/location': 'location_ss',
  'http://semantic-mediawiki.org/swivt/1.0#specialProperty_dat': 'meta_date_dts'
}
```

--------------------------------

### Command line enrichment

Source: https://opensemanticsearch.org/doc/data_enrichment

Examples of running the opensemanticsearch-enrich tool from the command line to perform specific data enrichment tasks.

```bash
opensemanticsearch-enrich --plugins *pluginname*
```

```bash
opensemanticsearch-enrich --plugins *pluginname* *query*
```

--------------------------------

### Fuzzy search example

Source: https://opensemanticsearch.org/doc/search/fuzzy

To do a fuzzy search use the tilde, "~", symbol at the end of a single word / term you want to search with fuzziness. For example to search for a term similar in spelling to "_roam_ " use the fuzzy search: `roam~` This search will find terms like _foam_ and _roams_.

```text
roam~
```

--------------------------------

### Second run with enabled OCR

Source: https://opensemanticsearch.org/doc/admin/scale

Force a second indexing run with OCR enabled after reconfiguring.

```bash
opensemarch-index-dir --force *dirname*
```

--------------------------------

### Index directories

Source: https://opensemanticsearch.org/doc/admin/cmd

Command to index all files within a directory.

```bash
opensemanticsearch-index-dir directoryname
```

--------------------------------

### Create password config file and add an user for search engine

Source: https://opensemanticsearch.org/doc/admin/config/password

Command to create the password config file and add the first user for search engine access.

```bash
htpasswd -c /etc/solr-php-ui/.htpasswd *username*
```

--------------------------------

### Phrase Searches

Source: https://opensemanticsearch.org/doc/search/operators

Example of using double quotes to perform an exact phrase search.

```text
"search engine"
```

--------------------------------

### Set OCR language to German

Source: https://opensemanticsearch.org/doc/admin/config

Configuration example for setting the OCR language to German ('deu') in the config file.

```python
# language for automatic text recognition (ocr)
# config['ocr_lang'] = "eng"
config['ocr_lang'] = "deu"
```

--------------------------------

### Setting maximal edit distance

Source: https://opensemanticsearch.org/doc/search/fuzzy

To change the maximum number of changeable chars, set the number after the ~ operator. Example: `searchterm~3`

```text
searchterm~3
```

--------------------------------

### Set OCR language to multiple languages

Source: https://opensemanticsearch.org/doc/admin/config

Example of configuring OCR to recognize multiple languages, such as English and German.

```python
# language for automatic text recognition (ocr)
config['ocr_lang'] = "eng+deu"
```

--------------------------------

### Index a file

Source: https://opensemanticsearch.org/doc/admin/cmd

Command to index a single file.

```bash
opensemanticsearch-index-file filename
```

--------------------------------

### Set language to german

Source: https://opensemanticsearch.org/doc/admin/config

Example of how to set the user interface language to German by modifying the $language variable in the config.php file.

```php
# Set language to german
$language = "de";
```

--------------------------------

### Create password config file and add an user for management tools

Source: https://opensemanticsearch.org/doc/admin/config/password

Command to create the password config file and add the first user for management tools access.

```bash
htpasswd -c /etc/opensemanticsearch-django-webapps/.htpasswd *username*
```

--------------------------------

### Index RSS Newsfeeds

Source: https://opensemanticsearch.org/doc/admin/cmd

Command to index a full feed from an RSS newsfeed.

```bash
opensemanticsearch-index-rss http://www.opensemanticsearch.org/feed
```

--------------------------------

### Monitor files

Source: https://opensemanticsearch.org/doc/admin/cmd

Command to monitor a specific file for changes and index it.

```bash
opensemanticsearch-filemonitoring filename
```
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