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    set -o posix, then you have unset is builtin instead of your fucntion, then unset builtin unset command. Commented Nov 10, 2017 at 7:06
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    @cuonglm, that looks like an answer. Commented Nov 10, 2017 at 7:20
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    @cuonglm I do hope you post an answer about that, not just so I can upvote it but also because, although I've done my very best to write in such a way as to avoid giving this impression, I fear that--as long as mine is the only answer--a few less careful readers might think the method I've shown is necessary even when readonly is not used. My solution is a hackish curiosity; yours is a real solution that might be used even for reasons other than fun, and that transmits important knowledge about the effects of POSIX mode in Bash. Commented Nov 10, 2017 at 8:06
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    In bash, you can also do: enable -n builtin unset command enable Commented Nov 10, 2017 at 8:32
  • @StéphaneChazelas, that looks like another way to "hose" any possibility to access builtins. (At a glance I thought it was a way to recover them.) Interesting. Commented Nov 10, 2017 at 8:35