[Solved] awk : parse and write to another file

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Use GNU awk for multi-char RS:

$ awk -v RS='</record>\n' '{ORS=RT} /<keyword>SEARCH<\/keyword>/' file 
<record category="xyz">
<person ssn="" e-i="E">
<title xsi:nil="true"/>
<position xsi:nil="true"/>
<names>
<first_name/>
<last_name></last_name>
<aliases>
<alias>CDP</alias>
</aliases>
<keywords>
<keyword xsi:nil="true"/>
<keyword>SEARCH</keyword>
</keywords>
<external_sources>
<uri>http://www.google.com</uri>
<detail>SEARCH is present in abc for xyz reason</detail>
</external_sources>
</details>
</record>

If you need to search for any of multiple keywords then simply list them as such:

$ awk -v RS='</record>\n' '{ORS=RT} /<keyword>(SEARCH1|SEARCH2|SEARCH3)<\/keyword>/' file

solved awk : parse and write to another file