Usage:
ruby [switches] [--] [program filename] [arguments]
Switches (or command-line options):
-0[ octal] Specify a record separator (\0 if no argument).
-a Autosplit mode with -n or -p (splits $_ into $F).
-c Check syntax only.
-C directory cd to directory before executing your script or program.
-d Set debugging flags (set predefined variable $DEBUG to true).
-e ' command' Execute one line of script. Several -es allowed. Omit [program filename].
-F pattern split( ) pattern for autosplit (-a).
-i[ extension] Edit ARGV files in place (make backup if extension supplied).
-I directory Specify $LOAD_PATH (predefined variable) directory; may be used more than once.
-K kcode Specify the character set. See Table 16.
-l Enable line-ending processing.
-n Assume 'while gets( ); ... end' loop around your script.
-p Assume loop like -n but print line also like sed.
-r library Require the library before executing your script.
-s Enable some switch parsing for switches after script name.
-S Look for the script using PATH environment variable.
-T[ level] Turn on tainting checks.
-v Print version number, then turn on verbose mode (compare --version).
-w Turn warnings on for your script or program.
-W[ level] Set warning level: 0=silence, 1=medium, and 2=verbose (default).
-x[ directory] Strip off text before #! shebang line, and optionally cd to directory.
--copyright Print the copyright.
--version Print the version (compare -v).