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miki123211 | on: A shell exclamation mark is not for yelling. Be lazy
IMO, !$ is most useful of them all (it is the one that gets replaced with the last argument of the last command).

!! you can do just as easily with up-arrow enter, which is just as quick. !ssh you can do with ctrl+r, which actually shows you what it's going to run and whether the last ssh is to where you think it is. sudo !! is up arrow, ctrl+a, 'sudo ', one more keystroke but it's natural if you know your readline. The rest are too complex and not worth learning. !$ is the sweet spot.

wwfn | parent | next
instead of !$, I use alt+. for the same reason `up` is preferable to `!!`.

!$:h is new to me. directory name of last argument is nice. I can imagine reaching for that. paired with alt-^ to replace the magic with the actual expanded text before hitting enter

wpm | root | parent
thank you for alerting me to the presence of Alt+.

No idea how I've missed this for as long as I have

floralhangnail | parent | next
`IMO, !$ is most useful of them all (it is the one that gets replaced with the last argument of the last command).`

I've been liking Esc+. for this. It doesn't usually work in browser sessions though, have to do Ctrl+[+. which is a strange feeling 3 finger salute. For some reason I'm able to remember that one rather than !$

Edit: apparently Alt+. does the same, wow.

| root | parent | next
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encom | parent
>!! you can do just as easily with up-arrow enter

  sudo !!
Crestwave | root | parent
Ctrl-P-A then typing sudo is just as easy, it's simply up to preference