
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:
-
!
is a special character indicating that a history substitution is going to be performed. -
${command}
is a placeholder for a command that you want to reference from your command history. -
${command_arguments}
represents any arguments or options that you want to pass to the referenced command.
By using !${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.