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Re:How to navigate directories faster with Bash (2015) by mturmon on Thursday April 22, 2021 @12:03PM (#26904309)
I don't think !$ is properly understood as a readline feature. It's a sh/bash abbreviation.

!! -> last whole command

!!:1 -> first argument of last command

!!:$ -> last argument of last command

!$ -> abbreviation for above

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