emacsclient:tldr:43a5e

The command emacsclient ${filename} is used to open a file in the Emacs text editor using the Emacs client/server architecture.

• emacsclient: It is the command-line utility for connecting to an existing Emacs server or starting a new one if it doesn't exist.
• ${filename}: This is a placeholder for the actual path and name of the file you want to open. You need to replace ${filename} with the specific file you want to edit.

When you execute this command, it checks if there is an Emacs server already running. If there is, it connects to the server and opens the specified file in a new buffer within the Emacs frame. If there is no server running, it starts a new one and opens the file in a new buffer.

Using emacsclient instead of directly running emacs has the advantage of faster startup time because the Emacs server remains running in the background, reducing the overhead of starting a new Emacs process every time you want to open a file.