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Re:Ask HN: Which tools have made you a much better programmer? by slim on Tuesday June 09, 2020 @07:24PM (#23472095)
you can do that in bash too, and any cli that uses readline library
Re:Ask HN: Which tools have made you a much better programmer? by kadonoishi on Wednesday June 10, 2020 @02:42AM (#23474587)

  set -o vi
Starts you in insert mode. To go back to the usual command-line editing,

  set -o emacs
Re:Ask HN: Which tools have made you a much better programmer? by chrisweekly on Tuesday June 09, 2020 @09:20PM (#23472850)
also zsh (tho it doesn't use readline per se)