The -o operator of the test command, combines two expressions and tests a logical OR relationship between them.
The logic of databases and mathematical sets is based on boolean operators. They link your search terms together to either increase or decrease the number of results you receive. These are the three fundamental boolean operators: AND, OR, and NOT.
By connecting two or more concepts that are related to one another (synonyms) with OR, you can extend your search results by informing the database that ANY of your search phrases may appear in the records that are returned.
When you type commands into a database, it follows those commands and responds with results. When employing Boolean operators, be mindful of the logical sequence in which words are connected.
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