I am writing a REXX program which will update a PS dataset. I can edit a particular line using my REXX code. But I would want a code to insert a particular string after a particular line.  

For Example: My PS dataset has 100 lines. I want to insert a text "ABCDE" after 44th line (in 45th line) which will increase the total lines of the file to 101 lines. The remaining lines should remain unchanged. Is this possible using REXX?