code: function outputHelp () {
    console.log('math.js')
    console.log('https://mathjs.org')
    console.log()
    console.log('Math.js is an extensive math library for JavaScript and Node.js. It features ')
    console.log('real and complex numbers, units, matrices, a large set of mathematical')
    console.log('functions, and a flexible expression parser.')
    console.log()
    console.log('Usage:')
    console.log('    mathjs [scriptfile(s)|expression] {OPTIONS}')
    console.log()
    console.log('Options:')
    console.log('    --version, -v       Show application version')
    console.log('    --help,    -h       Show this message')
    console.log('    --tex               Generate LaTeX instead of evaluating')
    console.log('    --string            Generate string instead of evaluating')
    console.log('    --parenthesis=      Set the parenthesis option to')
    console.log('                        either of "keep", "auto" and "all"')
    console.log()
    console.log('Example usage:')
    console.log('    mathjs                                Open a command prompt')
    console.log('    mathjs 1+2                            Evaluate expression')
    console.log('    mathjs script.txt                     Run a script file')
    console.log('    mathjs script.txt script2.txt         Run two script files')
    console.log('    mathjs script.txt > results.txt       Run a script file, output to file')
    console.log('    cat script.txt | mathjs               Run input stream')
    console.log('    cat script.txt | mathjs > results.txt Run input stream, output to file')
    console.log()
    process.exit(0)
  }
docs: Output a help message