Help: mysh show ruby command summary:

The show ruby (or @ruby) command is used to display useful information about the current ruby environment. This includes:

location - The path/name of the current ruby interpreter. description - A comprehensive summary of the version and other such data. version - The version of ruby. patch - Its patch level. revision - Its revision level. date - The date of its release. platform - The target platform. copyright - The legal ownership of the software. engine - The internal engine in the software. host - A summary of the host operating environment. host cpu - A (crude) approximation of the installed cpu. host os - The current operating system. host vendor - The current environment vendor/genre.

$: - An easy-to-read, formatted version of $: or the ruby search path.