Here is the syntax for the Ruby interpreter:
ruby [switches] [--] [program filename] [arguments]
Switches (or command-line options) include:
-0[ octal] Specify record separator (\0 if no argument)
-a Set autosplit mode with -n or -p (splits $_ into $F)
-c Check syntax only
-C directory cd to directory before executing your script
-d Set debugging flags (set $DEBUG to true)
-e 'command' Execute one line of script; several -e's allowed; omit [program filename]
-F pattern split( ) pattern for autosplit (-a)
-i[ extension] Edit ARGV files in place (make backup if extension is supplied)
-I directory Specify $LOAD_PATH directory (may be used more than once)
-K kcode Specify KANJI (Japanese) code-set
-l Enable line-ending processing
-n Assume 'while gets( ); ... end' loop around your script
-p Assume loop similar to -n but print line similar to 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 a PATH environment variable
-T[ level] Turn on tainting checks
-v Print version number, then turn on verbose mode
-w Turn on warnings for your script
-W[ level] Set warning level: 0 for silence, 1 for medium, 2 for verbose (default)
-x[ directory] Strip off text before #!ruby line and perhaps cd to directory
--copyright Print the copyright
--version Print the version (compare with -v)