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I wonder what percentage of even frequent shell users are even aware of !! or ^subst^ - an informal polling of 5 workmates here (engineers, command line git users, people I would have thought would know) shows no takers.

To be fair, I'm old and was thrilled to go from 300 to 1200 baud at one point.

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I recall that at University a lecturer showed this briefly in the early nineties. Most of us students stared in a mixture of awe and disbelief. I didn't learn those incantation from that brief introduction and never felt the need, even though I used a 2400 baud modem (already outdated, hence cheap) then.

Wow, I assumed it was universal. Retyping things, or copying and editing is so tedious.

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