Hi Team, Greetings! I was sitting next my system looking for some basic code brush up and was playing with CAT command, and though of some kind of additional features to our existing CAT command, such as... *"Write a CAT command program, which will allow appending text or lines of code at user specified line" not only at the end of file.* *Ex: cat >> filename.c line_number * Please suggest. Thanks, LoveToCode(DreamWalker)