Shell Script: Remove duplicate lines from file

------------------------------------------------------------------------------------------------
script        :  remblnk
purpose    :  remove empty or blank lines from an ascii file; replace the original file 
requires    :  standard GNU commands, file 
version     :  1.2  
------------------------------------------------------------------------------------------------
usage  :  rmblanks [-vhl] <file> [file...] 
options:  
     -v, verbose

     -h, usage and options (help)

     -l, see this script"
------------------------------------------------------------------------------------------------
Enjoy....Amit Kumar Roy
------------------------------------------------------------------------------------------------