Source File: CurrentlyProcessedFileName

Informatica PowerCenter provides an option to know the file name which is currently being processed by the ETL workflow. 

Please follow the screen shots below which indicate the steps to set it up.

Source Analyser:

However PowerCenter gives you the complete path to the file location, to get only the file name for further ETL validation/Integration.

Expression Code to get only the currently Processed File Name:

xml file:

REVERSE(ltrim(rtrim(CurrentlyProcessedFileName)))

IIF(INSTR(var_CurrentlyProcessedFileName,'\')>0,REVERSE(SUBSTR(var_CurrentlyProcessedFileName,1,INSTR(var_CurrentlyProcessedFileName,'\')-1)),REVERSE(var_CurrentlyProcessedFileName))