catch catch [planet]
This command lets you use public shuttles more effectively.
Without an argument, it will show you all other planets that the dock's shuttles can take you.
Provide a planet name, and you will automatically board the shuttle that goes to that destination, and automatically disembark once you reach it.
This is a cheap, easy way to get around, and public shuttles generally only go to "safe" planets. If you want to start exploring the MUD, using <catch> to explore the shuttle network is a really good place to start.