command: rev usage: reverse lines of a file or files syntax: $ rev [-V] [-h] [file ...] examples: 1. To print options and help of this command $ rev --help 2. To print Reverse the order of characters in every line $ cat rev.txt Quick brown fox jumps over the lazy dog $ rev rev.txt god yzal eht revo spmuj xof nworb kciuQ regards, dhanasekar Kanchilug Blog : http://kanchilug.wordpress.com To subscribe/unsubscribe kanchilug mailing list : http://kanchilug.wordpress.com/join-mailing-list/