Which CeWL command prints the help or usage information?

Which CeWL command prints the help or usage information?

• A. cewl --usage
• B. ceWL --help
• C. cewl --help
• D. ruby cewl.rb --help

Answer: (D)

CeWL is a Ruby script, so its usage information is shown by running the script with the interpreter and passing the help flag. Using the Ruby interpreter to execute it, as in “ruby cewl.rb --help,” reliably prints the usage details because you’re invoking the program exactly as a script file, regardless of whether it’s on the system PATH or has executable permissions. The other forms are unreliable: a differently capitalized command often won’t exist due to case sensitivity; a bare “cewl --help” relies on the script being installed as an executable in PATH, which isn’t guaranteed in every setup; and a nonstandard “--usage” flag isn’t commonly implemented. The most dependable way to view CeWL’s usage is to run the script with the --help option through the Ruby interpreter.

CeWL is a Ruby script, so its usage information is shown by running the script with the interpreter and passing the help flag. Using the Ruby interpreter to execute it, as in “ruby cewl.rb --help,” reliably prints the usage details because you’re invoking the program exactly as a script file, regardless of whether it’s on the system PATH or has executable permissions. The other forms are unreliable: a differently capitalized command often won’t exist due to case sensitivity; a bare “cewl --help” relies on the script being installed as an executable in PATH, which isn’t guaranteed in every setup; and a nonstandard “--usage” flag isn’t commonly implemented. The most dependable way to view CeWL’s usage is to run the script with the --help option through the Ruby interpreter.