Let's take this one step at a time.
#!/usr/local/bin/perl on Unix like systems is called the "shebang" line. This is normally:
#!/usr/bin/perl
This tells Unix what program to execute. On Windows this is "explained" in a different way.

The "-w" part tells Perl to 'use warnings;'
The 'print("Hi");' is the input to Perl.

So make a file "hello.pl" with:

#!usr/bin/perl -w
print "hello world\n";
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on Unix, you should just at least add "X" execute to permissions for at least u+x, (see chmod command).

Don't mess with fancy command line single line programs until you understand how to do this the "normal way".