SPL is the abbreviation for Search Processing Language. SPL is designed by Splunk for use with Splunk software.

SPL encompasses all the search commands and their functions, arguments, and clauses. Its syntax was originally based on the Unix pipeline and SQL. The scope of SPL includes data searching, filtering, modification, manipulation, insertion, and deletion.

Souce: https://docs.splunk.com/Splexicon:SPL
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