rake help

rake [-f rakefile] {options} targets...

Options are ...
-C, --classic-namespace Put Task and FileTask in the top level namespace
-D, --describe [PATTERN] Describe the tasks (matching optional PATTERN), then exit.
-n, --dry-run Do a dry run without executing actions.
-e, --execute CODE Execute some Ruby code and exit.
-p, --execute-print CODE Execute some Ruby code, print the result, then exit.
-E, --execute-continue CODE Execute some Ruby code, then continue with normal task processing.
-I, --libdir LIBDIR Include LIBDIR in the search path for required modules.
-N, --no-search, --nosearch Do not search parent directories for the Rakefile.
-P, --prereqs Display the tasks and dependencies, then exit.
-q, --quiet Do not log messages to standard output.
-f, --rakefile [FILE] Use FILE as the rakefile.
-R, --rakelibdir RAKELIBDIR, Auto-import any .rake files in RAKELIBDIR. (default is 'rakelib')
　　--rakelib
-r, --require MODULE Require MODULE before executing rakefile.
　　--rules Trace the rules resolution.
-s, --silent Like --quiet, but also suppresses the 'in directory' announcement.
-g, --system Using system wide (global) rakefiles (usually '~/.rake/*.rake').
-G, --no-system, --nosystem Use standard project Rakefile search paths, ignore system wide rakefiles.
-T, --tasks [PATTERN] Display the tasks (matching optional PATTERN) with descriptions, then exit.
-t, --trace Turn on invoke/execute tracing, enable full backtrace.
-v, --verbose Log message to standard output.
-V, --version Display the program version.
-W, --where [PATTERN] Describe the tasks (matching optional PATTERN), then exit.
-X, --no-deprecation-warnings Disable the deprecation warnings.
-h, -H, --help Display this help message.