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With PeopleTools 8.55 you can use Change Assistant command line to apply a PeopleTools patch.
example, to apply patch 8.55.02 you can use the following command line:
Changeassistant.bat -MODE UM -ACTION PTPAPPLY -TGTENV <YOUR_TARGET_DB_ENV_NAME_LIKE_PT855TST> -UPD PTP85502
Of course, the Change Assistant must be configured with your target environment information.