How to repeat the last part of a previous command?

I just tested and it seems you can do it the same way as in bash: !$.

Wether you are in bash or zsh, you can use the ! operator to recover arguments of your previous command:

If we take: echo a b c d as an example

• !$ - the last argument: d
• !:*- all the arguments: a b c d (can be shorten !*)
• !:1 - the first argument: a (same as !^)
• !:1-3 - arguments from first to third: a b c
• !:2-$ - arguments from the second to the last one: b c d

This last point answer you question, you can take the last part of your command.

Note: !:0 is the last command executed, here it would be echo in our example