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!$ recalls the last argument of the previous command. This is very useful when you have to operate several operations on the same file for example.
There are 2 alternatives - vote for the best!
If you can do better, submit your command here.
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. ( hopefully Alt+.) does the same. Moreover repeating it recalls the last argument of the previous commands from the history.
Yes, but Alt+. is harder to type than !$ (at least on a french keyboard, it's much easier to type !$ than Alt+.)