[Rd] Rscript on Windows

[Vladimir Eremeev]

ActivePerl has '-x' switch which tells it to skip all lines in the file till
"#!".
This allows writing perl scripts in ordinary .bat files.

?shQuote contains a link with the following perl script example:
===8<===
@echo off
:: hello.bat
:: Windows executable Perl script
:: Note:
::   assumes perl.exe is in path
::   otherwise, use absolute path
perl -x -S "%0" %*
goto end
#!perl

print "Hello, World!\n";
__END__
:end
:: ------ end of hello.bat ------

Windows Notes: 
" -x " (lower case x): Skip all text until shebang line. 
" -S " (upper case S): Look for script using PATH variable. Special meaning
in Windows: appends .bat or .cmd if lookup for name fails and name does not
have either suffix. 
" %* " only on WinNT/2K/XP; use %1 %2 . . . %9 on Win9x/DOS 
===8<===

I think the simplest way to implement shebang on windows would be embedding
one more command line switch with similar functionality to perl's '-x'.

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