git-repl:tldr:54604

The command you provided is often used in Unix-like systems, such as Linux, and is known as a history substitution. Here's how it works:

1. ! is a special character indicating that a history substitution is going to be performed.

2. ${command} is a placeholder for a command that you want to reference from your command history.

3. ${command_arguments} represents any arguments or options that you want to pass to the referenced command.

By using !${command} followed by ${command_arguments}, you are instructing the shell to retrieve a specific command from your history based on the placeholder ${command}, and then execute it along with the specified ${command_arguments}.

For example, let's say you previously executed the command ls -l to list the files in a directory. After that, you want to repeat the same command. Instead of typing ls -l again, you can simply use !ls to refer to the previous ls command and execute it.

In this case, !${command} will be replaced with the command you reference (e.g., ls), and ${command_arguments} will be replaced with the arguments you provide (e.g., -l).

Note: The actual behavior and supported syntax might differ based on the specific shell or operating system you are using, so it's always a good idea to consult the documentation or man pages for precise details.