Usage: casperjs [options] script.[js|coffee] [script argument [script argument ...]]
       casperjs [options] test [test path [test path ...]]
       casperjs [options] selftest
       casperjs [options] __selfcommandtest

Options:

--direct    Prints log messages to the console
--log-level Sets logging level
--help      Prints this help
--version   Prints out CasperJS version

Read the docs http://docs.casperjs.org/