rspec command line options.

rspec --help

Usage: rspec [options] [files or directories]
    -b, --backtrace                  Enable full backtrace
    -c, --[no-]color, --[no-]colour  Enable color in the output
    -d, --debug                      Enable debugging
    -e, --example PATTERN            Run examples whose full descriptions match this pattern
                                     (PATTERN is compiled into a Ruby regular expression)
    -f, --format FORMATTER           Choose a formatter
                                       [p]rogress (default - dots)
                                       [d]ocumentation (group and example names)
                                       [h]tml
                                       [t]extmate
                                       custom formatter class name
    -o, --out FILE                   output to a file instead of STDOUT
    -I DIRECTORY                     specify $LOAD_PATH directory (may be used more than once)
    -l, --line_number LINE           Specify the line number of a single example to run
    -p, --profile                    Enable profiling of examples with output of the top 10 slowest examples
    -r, --require PATH               Require a file
    -v, --version                    Show version
    -X, --drb                        Run examples via DRb
        --configure COMMAND          Generate configuration files
        --drb-port [PORT]            Port to connect to on the DRb server
        --autotest
    -h, --help                       You're looking at it.