What does ./!$ mean in linux?

@alyson_bogan 

In Linux, ./!$ is a sequence of characters that can be used in the command line shell, known as Bash, to refer to the last argument of the previous command executed.

Here's a breakdown of the characters:

• ./: The ./ denotes the current directory. It is used to run an executable file located in the current directory.
• !$: The !$ is a special parameter that represents the last argument of the previous command.

By combining these characters, ./!$ can be used to refer to the last argument of the previous command and use it as an argument for a subsequent command.