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OSH (Orchestrate SHell) is the internal scripting language of the IBM DataStage Engine (now IBM InfoSphere DataStage). DataStage uses OSH scripts to orchestrate data processing jobs at the engine level. Shell Script is a generic Unix shell scripting language. Scriptella is an open-source ETL scripting tool, not specific to DataStage. OSH is proprietary to DataStage and is what the engine uses internally for job orchestration and execution.