I have a perl script which can be run on Linux by typing 'perl script.pl arg'. But I want to run it without having to type the word 'perl' like this 'script.pl args'. There is an already existing file which runs without typing 'perl', so I know that there are no system settings required to be done. Also, I have included #usr/bin/perl and also changed the chmod to 755. None of this seems to work.