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(ruby/irb#451) * Document a full list of commands * Document debug as well * Make it less duplicated
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Partly address this problem #449 (comment):
With the current way of README format, I haven't noticed IRB had a long document at https://docs.ruby-lang.org/en/master/IRB.html until today. I find it more discoverable to just write them down in README like debug.gem https://github.com/ruby/debug#debug-command-on-the-debug-console.
So, while I added the list to the official documentation for its readers, I also added it to the README as well. This should be useful even after #450 since you'll somehow need to discover
helpcommand itself. Having that in README could be a good help.Note that this list is based on this comment. I think we could document this even better, e.g. have categories or show commonly-used commands first, but that shouldn't stop this PR from being merged. I'd like to focus on having something first, and then improve it in other PRs.