What is External Filter Stage?

1)External filter stage is a processing stage.
2)In Datastage User can filter the Data using Unix Commands(sed,cut, cat, grep, head etc) with the help of External filter stage.
External filter stage allows us to run these commands during processing the data in the job
Job:
Now I want to use grep command to filter input file(employee file-emp.txt)  with DEPTNO=10 

Command : grep  "10$"

Click the links below for input file(employee file-emp.txt) and dsx file for the Job-J_ExternalFilter

The Source File-emp.txt and dsx file for the Job-J_ExternalFilter

Job: