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Some way of automatically applying 'less' to shell commands when the output exceeds a limit (like 40 lines) but is otherwise invisible.

(There may be issues with automatically not doing this when piped.)

less -F will cause less to terminate if there's only one screenful of text. I usually forget to add it, so just knowing about -F isn't enough for me.

As for always applying it... I don't think bash has hooks to transform interactive command lines. Do other shells?

Another thing: exporting less(1) search history as grep commands, though a recent post made me realize I should use fzf and related tools instead.