自我更新的Bash脚本？

Question

I'm writing a utility using Bash scripting and I'd like to include an update feature with it. The script currently follows Ruby's gem philosophy, eg one command with multiple subcommands:

gem help
gem version
gem update

Ideally you would run:

myscript update

But I don't know if this is possible.

What's the best method of going about this? I know that writing to the currently running script is a Bad Idea.

Answer 1

Simply invoke wget to download the new version. After successful download, move it to the current script's location and chmod +x it.